Answer:
8.46%
Explanation:
Monthly interest rate = 0.640%
Number of month in year = 12
Investment in non-interest bearing = 6%
Effective annual interest = [(1 + Monthly interest rate)^Number of month] - 1 / (1 - Investment in Non-interest)
Effective annual interest = [(1 + 0.640%)^12] - 1 / (1 - 6%)
Effective annual interest = (1.0064)^12 - 1 / 0.94
Effective annual interest = 1.07956187072 - 1 / 0.94
Effective annual interest = 0.07956187072 / 0.94
Effective annual interest = 0.084640288
Effective annual interest = 8.46%
Hence, the Effective annual is 8.46%.