Let's use cross multiplication:
45ft --------------------->x%
92ft----------------------->100%
Therefore:
45/92 = x/100
Solving for x:
x = (45*100)/92 = 48.91%
So, the percent change is:
100% - 48.91% =51.09%
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Gross weekly salary = base salary + commision
Where:
Base salary = 11.50*t
t = hours worked
comission = S*0.06
If you work 40 hours and sell 5000, then:
t = 40
S = 5000
So:
Gross weekly salary = 11.50*(40) + 0.06(5000) = 460 + 300 = $760