a) 20%
b) 30%
c) 25%
d) 50%
Answer: a
Explanation: 100 (Initial C.P) — 20%↑ (initial profit) → 120(S.P)
120 (S.P) — 25%↑ → 150 (New S.P)
Let x be the new Cost price
Selling Price = 150
x × 1.25 = 150
x = 120
% change = $$ {\frac{{120 – 100}}{{100}}} \times 100$$ = 20%
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