**A) 20%**

B) 30%

C) 25%

D) 50%

Let,

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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