Explanation:
For Simone:
Funds needed = $575
Additional income after a year = $52
Total returns (ROI) = $627 or +11.81 %
For Riley:
Funds needed = $680
Additional income after a year = $55
Total returns (ROI) = $735 or +7.48%
Simone's investment is better preferred because it has a higher ROI of 11.81 % which is about 4 % greater than Riley'.
Other factors to consider is the associated risk in each investment, and their growth potential.