The regular price of a burger meal at a certain restaurant is $8.70. It is on sale for a 20% discount. What is the sale price of the hamburger meal?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c