Answer:
3.75%
Explanation:
You want to know the semiannual interest rate if the annual rate is 7.5%.
Periodic rate
The rate of interest for a period is the annual rate divided by the number of periods in a year.
Interest compounded semiannually is compounded 2 times per year. The semiannual rate is ...
7.5%/2 = 3.75% . . . . semiannual rate