RRB Group-D Model Paper 18 with answers for online practice

Question : 63 of 100

Marks: +1, -0

The simple interest at R % p.a. on a certain principal P is (9/16)th of P. If R is equal to the number of years (N), find the value of N.

Validate

Solution:

Given:
The simple interest at R % p.a. on a certain principal P is

(9/16)^{th}

of P and R is equal to the number of years (N).
Formula Used:
Simple interest = (Principal × time × rate)/100
Calculation:
⇒ 9P/16 = P × N × N/100
⇒ N2 = 900/16
⇒ N = 30/4 = 7.5 years
∴ required number of years = 7.5 years

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