Arithmetichard · Past Paper
If a merchant buys 11 pens for Rs. 10 and sells 10 pens for Rs. 11, find the profit percentage.
A21%
B11%
C25%
D10%
✓ Correct Answer: A — 21%
CP of 1 = 10/11. SP of 1 = 11/10. Profit % = [(121-100)/100]*100 = 21% (Using the square method: (11^2-10^2)/10^2 * 100).
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