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The average sales of a mobile shopkeeper was 16 mobiles per week, to increase the sales he decided to tie up with a finance company for providing mobiles to customers on installment. After the launch of this scheme his average sales increased to 28 mobile per week. The annual percentage increase in the sales of mobile was:

1. 90%
2. 75%
3. 70%
4. 85%
5. 60%

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Correct Answer - Option 2 : 75%


Average sales = 27 per week increased

Old sales = 16 per week



The average rate of percentage increase in both the cases- weekly and yearly will be the same.

⇒ Annual percentage in sales =                 (28-16) × 100/16

⇒ 75%

∴ annual percentage increase is 75%

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