Question : The cost of an article worth Rs. 100 is increased by 10% first and again increased by 10%. The total increase (in Rs.) is:
Option 1: 20
Option 2: 21
Option 3: 110
Option 4: 121
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Correct Answer: 21
Solution : The cost of the article is increased by 10%. The new cost becomes, = 100 + $\frac{10}{100}$ × 100 = Rs. 110 Then, this new cost is again increased by 10%. The final cost becomes, = 110 + $\frac{10}{100}$ × 110 = Rs. 121 Therefore, the total increase in cost = 121 – 100 = Rs. 21 Hence, the correct answer is 21.
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