Answer:
18.63 dollars.
Explanation:
The selling price was 45 + 15% or 45
= 45 + 0.15*45
= 51.75 dollars.
36% of 51.75
= 0.36 * 51.75
= 18.63 dollars which he had to spend on books.
18.63
45*115%= 45*1.15 = 51.75
51.75*0.36 = 18.63
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