To find out how many hours they'd have to work to make 50$, we would just divide $50 by their hourly wage.
Jennifer=50/5.50=9.09 hours since you cant have 0.09 hours round up Jennifer=10 hours to make at least $50 dollars
Edward=50/9.90=5.05 hours since you cant have 0.05 hours round up Edward=6 hours to make at least $50 dollars
**Edit. Since Edward earns 1.8 times what Jennifer earns, that means he earns 180% of what she earns or 80% more. So we can tell that he earns more just by the 1.8.