The interest amount of the loan is approximately 8742.1 yuan. The calculation method is as follows:

Since the Rural Credit Cooperative Fuxiang Convenience Card loan interest is an annual interest rate of 8.7421, the calculation formula is: principal * annual interest rate = interest, that is, 100,000 * 8.7421 = 8742.1 yuan.

Convenience cards are a type of credit card. Usually, the difference between convenience credit cards and ordinary credit cards is that in addition to the functions of ordinary credit cards, convenience cards can also enjoy convenient services, while ordinary credit cards cannot.