A) Convert the percentage to decimals.
40%= 0.40
Divide, 0.40/15.0
= 21.00
$21.00 dollars is the price of the book.
B) For this, we start off with finding the discounted price.
38*.25 (converted percentage)
plus 6% of the discounted price.
The book costs $28.56
For your third question:
Convert 90% to a decimal
= 0.9/40 = 36
He answered 36 questions correctly.
Hope this helps!~
