Correct Answer - Option 4 : 10%
Given:
SI is equal to the Principal,
The number of years is equal to the rate of interest
Concept Used:
SI = (P × N × R)/100,
Where,
P is Principal,
SI is Simple Interest,
N is total number of years,
R is rate
Calculation:
SI = P, and R = N,
Using in the formula,
P = (P × R × R)/100
⇒ 100 = R2
⇒ R = 10%
∴ Rate of interest is 10%.