Hello, I am having a great deal of trouble solving my homework assignment. I don't have a financial calculator and that seems to be the only method

Hello,

I am having a great deal of trouble solving my homework assignment. I don't have a financial calculator and that seems to be the only method of solving it that I can find available in our textbook.

The question is:

a. (Do not round intermediate calculations. Enter your answers as a percent rounded to 1 decimal place.)