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S.P = Rs 6520 Gain % = 12 %
We will solve by Unitary method

If S.P. is Rs 100 then C.P. is Rs 112
If S.P. is Rs 1 then C.P. is Rs 112/100

If S.P. is Rs 6520 then C.P. is Rs 112/100×6520= Rs 7302.40

Hence the C.P. is Rs 7302.40