Multiple choice

If I would have purchased $11$ articles for Rs. $10$ and sold all the articles at the rate of Rs. $11$ for $10$ the profit percent would have been

  1. $10\%$
  2. $11\%$
  3. $21\%$
  4. $100\%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

CP of 1 article = 10/11. SP of 1 article = 11/10. Profit = (11/10 - 10/11) / (10/11) = (121-100)/110 * 11/10 = 21/110 * 11/10 = 21/100 = 21%.