A shopkeeper sells an article at 25% loss. Find cost price of the article if selling price is ₹ 660.

₹ 880 ₹ 660 ₹ 600 ₹ 420

₹ 880

CP = 660 × \(\frac{100}{75}\) = 660 × \(\frac{4}{3}\) CP = 220 × 4 = 880