A shopkeeper buys mangoes at the rate of 4 a rupee and sells them at 1 a rupee. Find his net profit or loss percent?  Choose the correct choice:
A) 330 %  B) 390 %  C) 200 %  D) 250 %  E) 300%
The total number of mangoes bought by the shopkeeper be 12.   If he buys 4 a rupee, his CP = 1   He selling at 3 a rupee, his SP = 4   Profit = SP - CP = 4 - 1= 
<gadget id="calculator">4 - 1</gadget>
<output>3</output>
3   Profit Percent= 3/1 * 100= 
<gadget id="calculator">3/1 * 100</gadget>
<output>300</output>
300 %   Answer:300%
<result>E</result>
A shopkeeper buys mangoes at the rate of 4 a rupee and sells them at 1 a rupee. Find his net profit or loss percent?