Correct Answer - Option 2 : Rs. 631.945
Given:
The Rate of interest is 20 %
The Installment is Rs. 300
Number of installment is 3
Formula used:
P( 1+ R/100)n = X( 1+ R/100)n-1 + X( 1+ R/100)n-2 + X( 1+ R/100)n -3 + X( 1+ R/100)n-4 + ----
Where,
P = principal
R = Rate
n = number of installments
X = amount of installment
Calculation:
P(1 + 20/100)3 = 300(1+20/100)2 + 300(1 + 20/100)1+ 300
⇒ P(1.2)3 = 300 × 1.44 + 300 × 1.2 + 300
⇒ P(1.2)3 = 432 + 360 + 300
⇒ P = 631.945
∴ The sum is Rs. 631.95.