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The cost price of 13 articles is equal to the selling price of 11 articles. Find the profit percent?

The cost price of 13 articles is equal to the selling price of 11 articles. Find the profit percent?

A. 15 5/15%
B. 18 2/11%
C. 16 2/3%
D. 30%
Explanation:
13 CP = 11 SP
11 — 2 CP
100 — ? =>18 2/11%