Question
'C' sells a laptop at a profit of 50%. Had the profit
percentage earned on selling the laptop been numerically equal to the cost price of the laptop, then the profit earned on selling the laptop now would have been 500% more than previously. Find the actual cost price of the laptop.Solution
ATQ, Let the actual cost price of the laptop be Rs. '100x'. Therefore, selling price of laptop = Rs. '150x' (since profit is 50%). Therefore, profit earned = 150x - 100x = Rs. '50x'. New profit earned = 6 x 50x = Rs. '300x' (since the profit is 500% more). According to the question, 
Or, x = 3. Therefore, the actual cost price of the laptop = 100x = 100 x 3 = Rs. 300.
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