2、275

3、x( 1+0.45)×0.8-x=50

4、 100

5、300

6. Profit 6

7. Profit 3

8、300

9、x( 1+0.3)×0.8=2080

10、 150

2. 1. If x times are needed, then108 (1+0.1) =132× 0.1x.

x=9

2. If the price of this shirt is X yuan, then108 (1+0.1) = 0.9x.

x= 132

3. Let these two puzzles with different purchase prices buy X and Y yuan respectively.

Then (1+0.6) x = 80, (1-0.2) y = 80 x = 50, y= 100.

80+80-50- 100= 10

So I earned 10 yuan.

4. If you deposit X yuan for the first time, then 72+x=72/0.9.

x=8

So the second saving is 34-8 = 26 >: 200×0. 1=20.

So let's assume that the second actual payment is Y yuan.

(y+26-200)×( 1-0.8)=26-20

y=204

So the actual payment for the second book purchase is 204 yuan.

5. If X pieces are purchased,15 (x-12)-13x =1020.

x=600