A salesman has the liberty to sell a hair dryer in his store at a price between Rs. 300 and Rs. 700. Profit earned by selling
Profit = selling price – cost price
Loss = cost price – selling price
Given 650 – c.p. = 2(cp – 350)
650 – cp = 2cp – 700
650 + 700 = 2cp + cp
3cp = 1350
c p = 1350 / 3
= 450
So cost price of hair dryer will be Rs 450