A dealer sells a radio at a gain of 10%. If he had bought

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A dealer sells a radio at a gain of 10%. If he had bought it at 10% less and sold it for Rs. 132 less, he would have still gained 10%. The C.P. of the radio is ?

1. Rs. 1188
2. Rs. 1200
3. Rs. 1320
4. None of these

Correct Option: B

Let C.P. = P
Then S.P. = Rs. (110/100 x P) = Rs. 11P/10
New C.P. = Rs. (90/100 x P ) = Rs. 9P/10
New S.P. = (110/100 x 9P) / 100
∵ 11P/10 - 99P/100 = 132
⇒ P = 1200
∴ C.P. = Rs. 1200