Question

A baseball hat with an original price of $19 is on sale for 10% off the original price. How do you estimate the sale price?

Answer 1

multiply the original price by .9.

Explanation:

10% off is 100% - 10%

`100% - 10% = 90%`

`90 % = .9`

Since they only ask for an estimate of the sales price, we round up `19` to `20` and then treat it as though the hat was `20` dollars.

`9 xx 20 = 1.8` so take approximate $2.00 off

`19 -2 = 17` so about $ 17.00