A Ltd purchased a machine on Hire Purchase system from B Ltd on January 1, 2024, paying immediately ₹20,000 and agreeing to pay three instalments of ₹20,000 each on December 31 every year. The cash price of the machine is ₹74,500 and Hire Vendor charges interest at 5% p.a. The amount of interest payable by A Ltd to B Ltd on December 31, 2024 is: