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SP = Rs 690, Profit%= 15%

If CP is Rs 100, then SP is Rs 115
If SP is Rs 115, then CP is Rs 100
If SP is Re 1, then CP is Rs  \frac{100}{115}
If SP is Rs 690, then CP is Rs  \frac{100}{115} ×690=Rs 600

       = Rs(690-600)
       =Rs 90

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The answer will be 103.5
for 100 profit will be 15
100        15
690         ?   =690*15/100=103.5 Rs..............................
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