If percentage of profit made,when an article is sold for

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If percentage of profit made,when an article is sold for Rs.78, is twice as when it is sold for Rs.69, the cost price of the article is

1. Rs. 49
2. Rs. 51
3. Rs. 57
4. Rs. 60

Correct Option: D

As per the given in question ,
First S.P. = Rs. 78 , Second S.P. = Rs. 69
Initial profit on article = First S.P. - Second S.P.
Initial profit on article = Rs. (78 – 69) = Rs. 9
∴ C.P. of article = Rs. (69 – 9) = Rs. 60