The correct option is D Rs. 10,000
Here, amount paid by Mr. Black on final call is Rs 50*8,000 i.e. Rs 4,00,000. As per Table F of Schedule I to the Companies Act, 2013, if rate of interest on calls in advance in not mentioned in the AOA of the company, then it shall be levied at 12% p.a. So, interest on final call paid by Black will be 12% of Rs 4,00,000 i.e Rs 48,000. Mr Black paid the shares 2.5 months before the last date of payment. So, the interest paid will be (Rs 48,000/12)*2.5 i.e. Rs 10,000.