The manufacturing cost of a cell phone was $136. Sellers first marked up the cost by 25 percent. Sales were poor, so sellers decreased the markup to 17 percent. Calculate the old and new selling prices.

selling price = original cost + markup value

A.
old price was $170; new price is $164.90
B.
old price was $150.12; new price is $117
C.
old price was $170; new price is $159.12

Question

The manufacturing cost of a cell phone was $136. Sellers first marked up the cost by 25 percent. Sales were poor, so sellers decreased the markup to 17 percent. Calculate the old and new selling prices.

selling price = original cost + markup value

A. 
old price was $170; new price is $164.90
B. 
old price was $150.12; new price is $117
C. 
old price was $170; new price is $159.12

sukie · Answer

Do you know how to get the percentage cost?

sukie · Answer

100% =====> $136
25%    =====> ?

sukie · Answer

I used the cross method so it's like this :
Old price = manufacturing cost + (percentage*manufacturing cost)/100
Old price =136+(25*136)/100
Old price =$170

sukie · Answer

the other part is simple same steps. just change the percentage 25 to 17 in the equation above.

sukie · Answer

New price =136+(17*136)/100
New price =$159.12