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## ₹1000 is invested at 10 percent simple interest. Check at the end of every year if the total interest amount is in A.P. If this is an A.P. then find interest amount after 20 years.

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Sol.   Simple interest =  $P* R*N\over100$

Simple interest after 1 year = $1000 *10 *1\over100$  = 100

Simple interest after 2 year =  $1000 *10 *2\over100$ = 200

Simple interest after 3 year =  $1000*10 *3\over100$ =300

According to this the simple interest for 4, 5, 6 years will be 400,500 , 600 , respectively.

From this d = 100    and a = 100

Amount of simple interest after 20 years
tn= a+(n-1)d

t20= 100 +(20-1) 100

t20= 2000

Amount of simple interest after 20 years is = ₹ 2000

Arithmetic Progression September 28 , 2018 0 Comments 175 views