Selling Price (SP)= Cost Price (CP) - Loss Selling Price (SP)= Cost Price (CP)× Profit Factor Calculation: Let the cost price of B be Rs. x. Then, the cost price of A=3x. Selling price of A=3x−0.1×3x=3x−0.3x=2.7x Selling price of B=5∕4×x=1.25x Given: Selling price of A is Rs. 5,800 more than the selling price of B. ⇒2.7x−1.25x=5800 ⇒1.45x=5800 ⇒x=5800∕1.45 ⇒x=4000 Cost price of A=3x=3 ×4000=12000