Answer:
$42.35
Step-by-step explanation:
The discount is 6% so in decimal form it is .06. Multiply that by the original amount $42.50.
42.5 x .06 = 2.55
That is the discount amount so you would subtract you from the original amount.
42.5 - 2.55 = 39.95
That is the cost of the textbook after the discount is applied. To apply the sales tax you would:
39.95 x .06 = 2.397
That is the tax amount so you would add it to the cost of the book.
39.95 + 2.397 = 42.347
Since we are talking about money you would round it to 2 decimal points.
$42.35
Similarly you could just do:
1.0 - .06 = .94
42.5 x .94 = 39.95
It will give you the same answer if you don't want to do it the first way.
Hope it helps! (:
