College student are offered a 6% discount on a textbook that sells for $42.50. if the sales tax is 6%, find the cost of the textbook including sales tax

$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! (: