price of sweater
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Purchase Price= Xddm wrote:help
Selling Price = X+$30
Lets check #1.
Rev = 270 = Selling Price * Quantity (n)
270 = (X+30)*n >>> there are two unknown in one equation. Hence, #1 is alone INSUFF.
Lets check #2.
Selling Price = X + 50% X = 3/2*X
3/2*X=X+30 ---> x= $60 per sweater. But we still do not know how many were sold. #2 is INSUFF alone.
When #1 and #2 combined though, it works because we cal plug the selling price we calculated in #2 into the revenue equation in #1. So the answer is C.