The nominal interest rate given the effective rate and the number of compounding is 7.5%.
The effective rate is the actual interest rate earned on an investment when the rate of compounding is accounted for.
Nominal interest rate = m × [ ( 1 + i)^1/m - 1 ],
Where:
4 x [(1.077136)^0.25 - 1] = 7.5%
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