Owen bought 4 guide books. The original price of each guide book was $32. He was given 5% discount on the first guide book and 25% discount on the rest of the guide books. How much did he pay for the 4 guide books altogether?
Cost of the first guide book after 5% discount in percent
= 100% - 5%
= 95%

Cost of the first guide book after discount
= 95% x 32
= ⁹⁵₁₀₀ x 32
= $30.40

Number of the rest of the guide books that enjoyed 25% discount
= 4 - 1
= 3

Cost of each of the rest of the 3 guide books after 25% discount in percent
= 100% - 25%
= 75%

Cost of each of the rest of the 3 guide books
= 75% x 32
= ⁷⁵₁₀₀ x 32
= $24

Cost of the rest of the 3 guide books that enjoyed 25% discount
= 3 x 24 
= $72

Total cost for the 4 guide books
= 30.40 + 72
= $102.40

Answer(s): $102.40