10. I sum of Rs.5000 is invested at 9% simple interest (SI) per annum. Calculate the
interest at the end of each year. Do these interests form an AP? If yes, find the
interest at the end of 15 years.
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Step-by-step explanation:
P = 5000
R = 9%
SI for one year = PR/100
= 5000*9/100
= 450
SI for two years = PR*2/100
= 900
thus interest forms an AP
450, 900, 135...
a= 450, d= 450
t15 = a+14d
= 450+14*450
= 15*450
= 6750
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