In this problem you have to pay attention how to find the % of a number. To do that you divide the giving percent by 100 and your answer is now in decimal. With that in mind , let solve this beautiful problem, that was already solved by a great tutor Denise!!.
1) You need to pay attention to what exactly the problem asking for: How much do you paid for the necklace and how much was sold later
let answer those questions: a) Cost of the necklace $72. b) it is sold for 15% of it original price .
15% /100 = 0.15 x$72 = $10.80. Sold for $72 + $10.80 = $82.80
2) After selling the necklace $10.80 was the amount of money made .