X+X * 0.28 x9 = 3588.2%
x+0.0252x=3588.2
x=3500
2. Two years: 20/( 1-5/6)= 120.
One year: 120-20= 100
( 120+ 100)/ 1 1/ 15=300
300- 100- 120=80
3、; 30x20/(30+20)= 12
4. The profit of Star Appliance Shopping Mall: 20/( 100-20)= 25%
Lianhua appliance store offers benefits:1-20% discount = 20%
People's Shopping Mall, the profit of all electrical appliances in this shopping mall: 10%-20%.
Xuanxingxing household appliance shopping mall
5、 10/ 1 1=0。 9 1
0。 More than 9 1 10% discount.
Xiaoming's mother went to another store and bought it at a "10% discount" store.