Correct Answer - Option 4 : 300%
Given
Amount = 7 principal
Time = 2 years
Formula used
S.l = (P × r × t)/100
Where p, r, t are principal, rate, time respectively
Calculation
The principal is Rs. 100
So, the Amount will be Rs. 700
Simple interest = Rs.(700 - 100)
⇒ Rs. 600
Rate = (600 × 100)/(100 × 2)
Rate = 300%
∴ The rate is 300% per annum.