91Ó°ÊÓ

In the following exercises, find (a) the amount of discount and the amount of discount and (b) the discount rate. the discount rate. (Round to the nearest tenth of a percent if needed.) Nikki bought a patio set on sale for \(\$ 480 .\) The original price was \(\$ 850\) .

In the following exercises, find (a) the amount of the mark-up and (b) the list price. Daria bought a bracelet at wholesale cost \(\$ 16\) to sell in her handicraft store. She marked the price up 45\(\%\) .

In the following exercises, find (a) the amount of the mark-up and (b) the list price. Michael bought a classic car for \(\$ 8,500\) . He restored it, then added 150\(\%\) mark-up before advertising it for sale.

Priam bought a jacket that was on sale for 40\(\%\) off. The original price of the jacket was \(\$ 150\) . While the sales clerk figured the price by calculating the amount of discount and then subtracting that amount from \(\$ 150\) , Priam found the price faster by calculating 60\(\%\) of \(\$ 150\) . (a) Explain why Priam was correct. (b) Will Priam's method work for any original price?

Roxy bought a scarf on sale for 50\(\%\) off. The original price of the scarf was \(\$ 32.90 .\) Roxy claimed that the price she paid for the scarf was the same as the amount she saved. Was Roxy correct? Explain. (a)After completing the exercises, use this checklist to evaluate your mostery of the objectives of this section. (b)What does this checklist tell you about your mastery of this section? What steps will you take to improve?

In the following exercises, solve the problem using the simple interest formula. Find the principal invested if \(\$ 636.84\) interest was earned in 6 years at an interest rate of 4.35\(\% .\)

In the following exercises, solve the problem using the simple interest formula. In 10 years, a bank account that paid 5.25\(\%\) earned \(\$ 18,375\) interest. What was the principal of the account?

In the following exercises, solve the problem using the simple interest formula. Margaret's car loan statement said she would pay \(\$ 7,683.20\) in interest for a 5 year loan at 9.8\(\% .\) How much did Margaret borrow to buy the car?

In the following exercises, solve the problem using the simple interest formula. Diego invested \(\$ 6,100\) in a 9 -month certificate of deposit paying 1.8\(\%\) interest. How much interest did he earn form this investment?

In the following exercises, write each sentence as a proportion. \(\$ 9.36\) for 18 ounces is the same as \(\$ 2.60\) for 5 ounces.