The difference between the selling prices of a keyboard at losses 15% and 25% is ₹ 50. Then the cost price of a keyboani is :
differnce between loss % is 25%-15%=10, which is equal to 50,
$$10\%\longrightarrow\ 50$$
100%$$\longrightarrow\ 500$$
Hence option 'D' is correct.
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