Crazy Eddie has a key chain factory. Eddie managed to decrease the cost of manufacturing his key chains while keeping the same selling price, and thus increased the profit from the sale of each key chain from 20% of the selling price to 50% of the selling price. If the manufacturing cost is now $50, what was it before the decrease?
Choose the correct answer
A) $20 B) $40 C) $50 D) $80 E) $100
cost+profit=income (selling price)   profit now = 0.5x or x-50   0.5x=x-50   50=0.5x   x=100$ is selling price   so, profit before was  0.2*100= 
<gadget id="calculator"> 0.2*100</gadget>
<output>20</output>
20$   cost=100-20= 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80$   ANSWER:$80
<result>D</result>
Crazy Eddie has a key chain factory. Eddie managed to decrease the cost of manufacturing his key chains while keeping the same selling price, and thus increased the profit from the sale of each key chain from 20% of the selling price to 50% of the selling price. If the manufacturing cost is now $50, what was it before the decrease?