Please Help

You are given the following that(Ia)21 66.75817. Calculate i. This is a challenge problem. Hint: set up a timeline using the equivalence formula from the calculator and use CF worksheet to find the interest. You may have to use t-1. You are given the following that(Ia)21 66.75817. Calculate i. This is a challenge problem. Hint: set up a timeline using the equivalence formula from the calculator and use CF worksheet to find the interest. You may have to use t-1