## Discussion

1. A retailer increase the selling price by 25% due to which his profit percentage increases from 20% to 25%. What is the percentage increase in cost price ?
1. 20%
2. 30%
3. 25%
4. 50%
1. ##### Correct Option: A

In beginning
Cost Price (CP) = Rs. 100
Profit % = 20
Selling Price (SP) = 120

When profit increases from 20% to 25%
Cost Price (CP) = y
Profit % = 25
Selling Price (SP) after 25% increase = 120 + 25% = Rs. 150

From question
y + 25 % profit = 150

1.25 y = 150
so y = 120

% change in cost price = [ (120 - 100) / 100 ] x 100 = 20%
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