Find the effective rate of interest corresponding to a nominal rate of 7.5% per year compounded annually, semiannually, quarterly, and monthly. (Round your answers to two decimal places.)

a) Annually: 7.50%, Semiannually: 7.64%, Quarterly: 7.61%, Monthly: 7.73%
b) Annually: 7.50%, Semiannually: 7.65%, Quarterly: 7.68%, Monthly: 7.75%
c) Annually: 7.50%, Semiannually: 7.67%, Quarterly: 7.71%, Monthly: 7.78%
d) Annually: 7.50%, Semiannually: 7.69%, Quarterly: 7.75%, Monthly: 7.80%