1 Answers
Option 1 : Quantity A > Quantity B
Quantity A:
Future value of the installment = 9000
Present value of the installment = 15000 - 8000 = 7000
Interest charged for the installment = future value - present value = 9000 - 7000 =2000
We know
Interest = PRT/100
P = 7000 and T = 1/12
⇒ 2000 = (7000 × R) / (100 × 12)
⇒ 2000/7000 = R/1200
⇒ R = 2 × 1200/7
∴ Rate of interest for the installment plan is 342.85%
Quantity B:
Future value of the installment = 11000
Present value of the installment = 20000 - 10000 = 10000
⇒ Interest charged for the installment = future value - present value = 11000 - 10000 = 1000
We know
Interest = PRT/100
P= 10000 and T = 1/12
⇒ 1000 = (10000 × R) / (100 × 12)
⇒ 1000/10000 = R/1200
⇒ R = 120%
∴ Rate of interest for the installment plan is 120%
We can see that
∴ Quantity A > Quantity B