Question:An enterprising businessman earns an income of Rs `1` on the first day of his business.On every subsequent day ,he earns an income which is just double of that made on the previous day.On `10 th` day of business, he earns an income of : 

A `Rs 2^9` 
B `Rs 2^10` 
C Rs10^2` 
D `Rs`10` 

+ Answer
A 

+ Explanation
2nd day he earns `= 2 = 2^(2-1)`

3rd day he earns `= 2^(3-1)`

On `10 th`day he earns `2^(10- 1) = 2^9` rupees.

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Irin Moni

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