Hurst Corp has the following investment opportunities available to accumulate $50M ten years from now. (245,600)

A. Invest $ 2,849,165 at the end of each year for 10 years.

B. Invest $591,366 at the end of every quarter for 40 quarters.

C. Invest $1,957,350 at the end of every six months for 20 semi-annual periods.

D. Invest $280,000 at the end of every month for 10 years.

Determine the RoR (Rate of Return per year) for each alternative

Using formulas or charts, D is giving me the most trouble though