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A sum of money doubles itself in 7 years. In how many years it will become four fold?

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Important Questions on Simple Interest

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A certain sum of money amounted to Rs. 575 at 5% in a time in which Rs. 750 amounted to Rs. 840 at 4%. The rate being the simple interest. What was the sum?
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Rs.4,000 is divided into two parts such that if one part be put at 3% and the other at 5%. The annual interest from both the investments be Rs.144. Find the first part?
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A sum of money amounts to Rs. 767 in 3 years and Rs. 806 in 4 years at the rate of 6%. What is the sum?
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In how many years will a sum of money double itself at 12% per annum on simple interest?
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What annual payment will discharge a debt of Rs. 580 due in 5 years, the rate being 8% per annum?
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IMPORTANT
A lent Rs. 600 to B for 2 years and Rs. 150 to C for 4 years and received altogether from both Rs. 90 as simple interest. The rate of interest is _____.