Cole bought 4 magazines. The original price of each magazine was $10. He was given 15% discount on the first magazine and 20% discount on the rest of the magazines. How much did he pay for the 4 magazines altogether?
Cost of the first magazine after 15% discount in percent
= 100% - 15%
= 85%

Cost of the first magazine after discount
= 85% x 10
= ⁸⁵₁₀₀ x 10
= $8.50

Number of the rest of the magazines that enjoyed 20% discount
= 4 - 1
= 3

Cost of each of the rest of the 3 magazines after 20% discount in percent
= 100% - 20%
= 80%

Cost of each of the rest of the 3 magazines
= 80% x 10
= ⁸⁰₁₀₀ x 10
= $8

Cost of the rest of the 3 magazines that enjoyed 20% discount
= 3 x 8 
= $24

Total cost for the 4 magazines
= 8.50 + 24
= $32.50

Answer(s): $32.50