Hi there,
First, add all the hours she worked during the week up,
3.5 + 4.25 + 3.75 + 2.5 + 4.75 = 18.75
18.75 hours times the hourly wage, 18.75 x 5.85 = $109.60
Hannah estimated her earning would be $120, but it is only $109.60
So it is almost $10 less.
Hope this helps :)