Henry bought 3 story books. The original price of each story book was $24. He was given 5% discount on the first story book and 25% discount on the rest of the story books. How much did he pay for the 3 story books altogether?
Cost of the first story book after 5% discount in percent
= 100% - 5%
= 95%

Cost of the first story book after discount
= 95% x 24
= ⁹⁵₁₀₀ x 24
= $22.80

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

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

Cost of each of the rest of the 2 story books
= 75% x 24
= ⁷⁵₁₀₀ x 24
= $18

Cost of the rest of the 2 story books that enjoyed 25% discount
= 2 x 18 
= $36

Total cost for the 3 story books
= 22.80 + 36
= $58.80

Answer(s): $58.80