Correct Answer - Option 4 : 50%
Given:
Amount = 5P
Time = 8 years
Formula used:
A = P + S.I.
S.I. = PRT/100
Where, P = Principal, S.I. = Simple interest
A = Amount, R = Rate of interest, T = Time
Calculation:
A = P + S.I.
⇒ 5P = P + S.I.
⇒ S.I. = 4P ---(1)
As we know that, S.I. = PRT/100
From equation (1), we can write
⇒ 4P = (P × R × 8)/100
⇒ R = 50%
∴ The rate percent is 50%.