A sum of ₹725 is lent in the beginning of a year at a certain percentage rate of interest per annum. After 8 months, a sum
of ₹362.50 more is lent, but at double the previous rate. At the end of the year, ₹53.50 is earned as simple interest from
both the loans. What was the original rate of interest per annum (correct to two decimal places)?

A

4.53%

B

6.53%

C

5.2%

D

5.53%