Solve a,b and c please

Compound interest, solve the exercises that are presented to you (in digital format) Include in your resolution: Approach, Formula, Clearance, Substitution and Result a) A financial institution offers that for any amount that was given to it, it will return double after 20 months, what compound interest is it paying? b) Three million is invested at the beginning of the year 2020 at a rate of 10% per annum, compounded monthly. How much will have accumulated at the end of the year 2029? c) Determine the future value and present value of an annuity of 5,000 to be paid semi- annually for 7 years 6 months at 8.6% annual interest compounded quarterly