a certain amount of money amounts to 4400 in 2 years and to rs 4600 in 3 years find the principal in the rate of interest
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simple interest = principal*rate*time/100
interest of one year = 4600 - 4400 = 200
then, principal = 200*100/R*1
PR = 20000
I = PRT/100
for first two years, I = 20000*2/100
I = 400
principal = amount - interest
principal = 4400 - 400 = 4000
R = I*100/PT
R = 400*100/4000*2
R = 5%
interest of one year = 4600 - 4400 = 200
then, principal = 200*100/R*1
PR = 20000
I = PRT/100
for first two years, I = 20000*2/100
I = 400
principal = amount - interest
principal = 4400 - 400 = 4000
R = I*100/PT
R = 400*100/4000*2
R = 5%
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