3 Select the correct answer.
markup = original cost × percentage markup

selling price = original cost + markup

The manufacturing cost of a cell phone was $124. Sellers first marked up the cost by 20 percent. Sales were poor, so sellers decreased the markup to 15 percent. Calculate the old and new selling prices.

A.
old price: $170.00; new price: $148.80
B.
old price: $142.60; new price: $148.80
C.
old price: $148.80; new price: $142.60