A shopping mall can be regarded as something that 90 yuan sold for 100 yuan, that is, 90 yuan bought 40 bags at 2.25 yuan each.

Mall B offers a discount of 0.85, which is equivalent to 2.5 times 0.85=2. 125 yuan per package.

1in 60 yuan, you can buy 5 boxes of 80 packs in c mall, which is equivalent to 2 yuan per pack.

Therefore, it is more cost-effective to go to C Mall.

A buys five cases of 200 yuan and gets a 20% refund.

B Buy five boxes 170 yuan.

C buy five boxes 160 yuan.

The third/third in ten days' work

A shopping mall100/(100+10) * 40 = 400/1yuan.

Mall b: 40 * 0.85 = 34 yuan per box.

Mall C: 4/(4+ 1)*40= 32 yuan per box.

40÷ 16=2.5 yuan/bag

Answer: Buy 100 Yuan ÷2.5=40 packs.

100- 10=90 yuan

90÷40=2.25 yuan/bag

B:

2.5×85%=2. 125 yuan

C: 2.5×4÷(4+ 1)=2 yuan.

Shopping mall B with 1-3 bags is cost-effective.

It's more cost-effective to buy 4 packs in c mall.

400/ 1 1 & gt； 34 >； 32

So mall c is cost-effective.

Do you sell by the box or by the bag? Different sales methods have different answers.

If you sell by the box, it's a good deal for C.

If you sell by bag, that is: if you only need 1-4 bags (instead of buying 1-4 bags, for example, if you only need 4 bags, you don't have to go to C to buy 4 bags and get 5 bags), then B is cost-effective, and if you need more than 4 bags, C is cost-effective.

Is this a primary school math problem? Olympics, right?

Mall A100 ÷ (100+10) ≈ 0.9 1, 91The discount is not as good as that of Mall B.

Shopping mall C 4 ÷ 5 = 0.8, 20% discount.

If you buy by the box, 16 is a multiple of 4, then shopping mall C is cost-effective.

If you buy it in retail, it is cost-effective for B (1, 2, 3, 4), (7, 8, 9), (14, 15).

Other c cost-effectiveness

For example, if you buy 19 package, store b will consume19× 0.85 = 16.15 package, and store c will consume16 package.

If you buy 20 packs, Store B will spend 20× 0.85 = 17 packs, and Store C will spend 16 packs.

Buy 2 1 pack, store B consumes 2 1× 0.85 = 17.85 pack, and store C consumes 17 pack.

Buy 22 packs, store B consumes 22× 0.85 = 18.7 packs, and store C consumes 18 packs.

……

Answer: 40 times 3= 120 (yuan)100+20-10 =10 (yuan)10 divided by (/.

B: 40 times 85%=34 (yuan) 34 divided by 16=2. 125 (yuan).

Shopping Mall B has 2. 125 yuan per bag of milk.

C: 40 times 4= 160 (yuan) 160 divided by 5 divided by 16=2 (yuan).

Shopping Mall C each bag of milk, 2 yuan.

A: it's cost-effective to go to mall C.

The unit price of each bag of milk is 40 divided by 16=2.5.

A shopping mall can be regarded as something that 90 yuan sold for 100 yuan, that is, 90 yuan bought 40 bags at 2.25 yuan each.

Mall B is 0.85 discount, which is equivalent to 2.5 times 0.85=2. 125 yuan per package.

1in 60 yuan, you can buy 5 boxes of 80 packs in c mall, which is equivalent to 2 yuan per pack.

Therefore, it is more cost-effective to go to C Mall.

A buys five cases of 200 yuan and gets a 20% refund.

B Buy five boxes 170 yuan.

C buy five boxes 160 yuan.

The third/third in ten days' work

A shopping mall100/(100+10) * 40 = 400/1yuan.

Mall b: 40 * 0.85 = 34 yuan per box.

Mall C: 4/(4+ 1)*40= 32 yuan per box.

40÷ 16=2.5 yuan/bag

Answer: Buy 100 Yuan ÷2.5=40 packs.

100- 10=90 yuan

90÷40=2.25 yuan/bag

B:

2.5×85%=2. 125 yuan

C: 2.5×4÷(4+ 1)=2 yuan.

Shopping mall B with 1-3 bags is cost-effective.

It's more cost-effective to buy 4 packs in c mall.

400/ 1 1 & gt； 34 >； 32

So mall c is cost-effective.

Do you sell by the box or by the bag? Different sales methods have different answers.

If you sell by the box, it's a good deal for C.

If you sell by bag, that is: if you only need 1-4 bags (instead of buying 1-4 bags, for example, if you only need 4 bags, you don't have to go to C to buy 4 bags and get 5 bags), then B is cost-effective, and if you need more than 4 bags, C is cost-effective.

Is this a primary school math problem? Olympics, right?

Mall A100 ÷ (100+10) ≈ 0.9 1, 91The discount is not as good as that of Mall B.

Shopping mall C 4 ÷ 5 = 0.8, 20% discount.

If you buy by the box, 16 is a multiple of 4, then shopping mall C is cost-effective.

If you buy it in retail, it is cost-effective for B (1, 2, 3, 4), (7, 8, 9), (14, 15).

Other c cost-effectiveness

For example, if you buy 19 package, store b will consume19× 0.85 = 16.15 package, and store c will consume16 package.

If you buy 20 packs, Store B will spend 20× 0.85 = 17 packs, and Store C will spend 16 packs.

Buy 2 1 pack, store B consumes 2 1× 0.85 = 17.85 pack, and store C consumes 17 pack.

Buy 22 packs, store B consumes 22× 0.85 = 18.7 packs, and store C consumes 18 packs.

……

Answer: 40 times 3= 120 (yuan)100+20-10 =10 (yuan)10 divided by (/.

B: 40 times 85%=34 (yuan) 34 divided by 16=2. 125 (yuan).

Shopping Mall B has 2. 125 yuan per bag of milk.

C: 40 times 4= 160 (yuan) 160 divided by 5 divided by 16=2 (yuan).

Shopping Mall C each bag of milk, 2 yuan.

A: it's cost-effective to go to mall C.

Suppose you buy milk 100 yuan.

A:1140 *16 = 44 packs.

B: 40 * 0.85 = 34 yuan/box.

100/34 * 16 is about 47 packs.

C: 100/40 * 16 = 40 packages.

40/4+40 = 50 bags

A is less than b and less than C.

A: it's most cost-effective to go to store C.