DRDO Multi tasking staff Model paper 5

Simple Interest = PRT/100
Here, R = 5%
T = 4 years
Total amount = P + I = 12000
⇒ I = 12000 - P
⇒ I = P × 5 × 4/100
⇒ 12000 - P = 20P/100
⇒12000 – P = 0.2P
⇒ 12000 = 1.2P
∴ P = 12000/1.2 = Rs. 10,000