A shopkeeper earns twice profit after selling an article in Rs 78 then the profit incurred after selling the article in ₹69. Find cost price of the article.

₹65 ₹60 ₹72 ₹75

₹60

Profit after selling the article at Rs.78 = 78 - C.P. Profit after selling the article at Rs.69 = 69 - C.P. ATQ, 78 - C.P. = 2 × (69 - C.P.)   78 - C.P. = 138 - 2 C.P. C.P. = 60