16. In how much time will a sum of money double if invested at 8% simple interest per a
17. The SI on a certain sum for 3 years at 10% p.a. is * 399 more than the Sl on the same
[Hint: Let the principal be 100. Interest will also be 100.]
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Step-by-step explanation:
16. Let sum of money=Rs. x
Therefore amount=Rs. 2x
Interest = sum × time × R/100
=x × time × 8/100
=8x × time/100
Amount = sum + interest
2x = x + 8x × time/100
2x = 100x + 8x × time/100
200x = 100x + 8x × time
100x = 8x × time
time = 100x.
time = 100x/8x
time=12.5years.
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