Question

When Arpita invests a certain sum of money, she observes that the ci for the second year is 1380 and for the 3rd year it is 1587, when it is compounded yearly,. Calculate the rate of interest and the sum of money invested.

Answer 1

Answer:

i hope its help you

Answer 2

Answer:

rate = 15%

sum of money inevsted/principal: rupees 8000.

Step-by-step explanation:

given:

CI for 3rd year = 1587;

CI for 2nd year = 1380;

CI for 2nd year - CI for 3rd year = 207;

   $r = 100*CI/P*I$

=100*207/1380*1;

=15% p.c.p.a.

Let p = 100;

$CI = PTR/100 P = principle; T = time; R = rate$

CI for first year = 100*1*15/100

                         =rupees 15;

CI for 2nd year = 115*1*15/100

                         = 17.25;

principle for 2 years

$X = 100*1380/17.25;\\ = rupees 8000;$

principle = 8000;