A sum was put at simple interest at a certain rate for 2 years . Had it been put at 3% higher rate, it would have fetched Rs 300 more. The sum is

Let the sum be P.
And the original rate be y% per annum.
Then new rate=(y+3)% per annum
According to question, [(P × (y+3) × 2)/100]=[(P × y × 2)/100]=300
∴ [(Py + 3P)/100]=[Py/100] = 150
∴ Py+ 3P - Py=15000
∴ 3P=15000
∴ P= 5000
Thus, the sum is Rs 5000