If apples are bought at the rate of 30 for Rs.100. How many apples must be sold for Rs.100 so as to gain 20%?  Choose the correct choice from the following choices
A) 28  B) 25  C) 20  D) 22  E) 23
SP for 30 apples to gain 20%= 100*120/100= 
<gadget id="calculator">100*120/100</gadget>
<output>120</output>
120   so 30 apples must be sold for rs 120   rs 120= 30 apples   rs 100= (30/120)*100= 
<gadget id="calculator">(30/120)*100</gadget>
<output>25</output>
25 apple   ANSWER:25
<result>B</result>
If apples are bought at the rate of 30 for Rs.100. How many apples must be sold for Rs.100 so as to gain 20%?