AFCAT Model Paper 2

Given:
Rate of interest(R) = 20%
Principal(P) doubles itself in (T + 2) years
Formula used:
SI=

(P×R×T)

100

P = Principal, R = Rate, T = Time
Calculation:
According to the question
2P=P+PR×

(T+2)

100

⇒ P=PR×

(T+2)

100

⇒ 100 = 20 × (T + 2)
⇒ 5 = T + 2
∴ The required time is T = 3 years.