A man purchased a cow for Rs. 3000 and sold it the same day for Rs. 3600,allowing the buyer a credit of 2 years. If the rate of interest be 10% per annum, then the man has a gain of :  Options
A) 0%  B) 5%  C) 7.5%  D) 10%  E) 40%
Solution   C.P. = Rs. 3000. S.P. = Rs. [ 3600x 100/100+( 10x2 ) ] = Rs. 3000   Gain = 0 %.   0%nswer 0%
<result>A</result>
A man purchased a cow for Rs. 3000 and sold it the same day for Rs. 3600,allowing the buyer a credit of 2 years. If the rate of interest be 10% per annum, then the man has a gain of :