Calculate the percentage gain of a merchant who purchased 90 kg of oranges for Rs. 450 and sold the whole lot at the rate of Rs. 7.50 per kg.
Choose the correct choice from the following choices:  A) 50 %  B) 60 %  C) 55 %  D) 70 %  E) 58%
C.P. of 1 kg = 450/90 = Rs. 5   S.P. of 1 kg = Rs. 7.50   Gain = 7.50-5= 
<gadget id="calculator">7.50-5</gadget>
<output>2.5</output>
2.50   Gain %= 2.50/5 * 100= 
<gadget id="calculator">2.50/5 * 100</gadget>
<output>50</output>
50%. 50 %nswer: 50 %
<result>A</result>
Calculate the percentage gain of a merchant who purchased 90 kg of oranges for Rs. 450 and sold the whole lot at the rate of Rs. 7.50 per kg.