Answer: D. and assuming they retire at age 50, Cindy will have over 50% more than Melvin
Step-by-step explanation:
Since Melvin begins his retirement fund at age 30, depositing $1,000 per month until age 50 while Cindy begins her retirement fund at age 20, depositing the same $1,000 per month amount until age 50 with a 5% annual interest on their funds, then we can deduce that if they retire at age 50, Cindy will have over 50% more than Melvin.
Therefore, the correct option is D.