Question

Mr. rohit bought some CD's at 4 for Rs. 100 and sold them at 4 for Rs.110. How many CD's did he purchase if he gained Rs. 245 in the transaction

Answer 1

C.P. for 4 CDs is ₹100 and S.P. in ₹110.
So, gain for 4 CDs is ₹110-₹100=₹10
Gain on 1 CD is ₹10/4= ₹2.5

So if he gained ₹245,
No. of CDs purchased= ₹245/₹2.5 = 98
Ans: 98 CDs