Tom bought 3 non-fiction books. The original price of each non-fiction book was $32. He was given 5% discount on the first non-fiction book and 25% discount on the rest of the non-fiction books. How much did he pay for the 3 non-fiction books altogether?
Cost of the first non-fiction book after 5% discount in percent
= 100% - 5%
= 95%

Cost of the first non-fiction book after discount
= 95% x 32
= ⁹⁵₁₀₀ x 32
= $30.40

Number of the rest of the non-fiction books that enjoyed 25% discount
= 3 - 1
= 2

Cost of each of the rest of the 2 non-fiction books after 25% discount in percent
= 100% - 25%
= 75%

Cost of each of the rest of the 2 non-fiction books
= 75% x 32
= ⁷⁵₁₀₀ x 32
= $24

Cost of the rest of the 2 non-fiction books that enjoyed 25% discount
= 2 x 24 
= $48

Total cost for the 3 non-fiction books
= 30.40 + 48
= $78.40

Answer(s): $78.40