Question

If there is a 10% sale on an item, and then a 9% sales tax applied to the after sale price, then what is the total cost of the item including tax as a percentage of it's pre-sale sticker price? ​

Answer 1

Answer:

A 10% sale means that the post-sale price of the item is now 90%, or 0.9 of the original cost of the item. We then apply 9% sales tax by multiplying the 0.9 by 109%, or 1.09. 0.9 * 1.09 = . 981, so the total cost of the item is 98.1% of the original pre-sale sticker price.

Explanation: