Piyush, Harmesh, and Atul are partners. Each partner regularly withdrew ₹ 20,000 per month is given below.

Piyush, Harmesh, and Atul are partners. Each partner regularly withdrew ₹ 20,000 per month is given below.

a) Piyush withdrew in the beginning of the month;

b) Harmesh withdrew in the middle of the month; and

c) Atul withdrew at the end of the month.

Interest on drawings charged for the year ended 31st March 2023 was ₹ 15,600, ₹ 14,400, and ₹ 13,200 respectively.

Determine the rate of interest charged on drawings.