Question
In what time will Rs 10000 earn an interest of Rs. 12600 at 18% per annum simple interest?
Hint:
Use the formula for simple interest and then find the number of years T.
The correct answer is: Rs 12600
Complete step by step solution:
We calculate simple interest by the formula,
…(i)
where P is Principal amount, T is number of years and R is rate of interest
Here, we have R = 18% ,SI = 12600, P = 10000 and T = ?
On substituting the known values in (i), we get 
In 7 years, Rs 10000 earns an interest of Rs 12600 at 18% per annum simple interest.
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Note:
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