Answer: 2 weeks
Step-by-step explanation:
Given: Amount in the saving account = $340
Hourly wage = $12.50
Maximum number of hours Jill can work = 40
Amount she can make by working 40 hours in a week = $ (40 x 12.50 )= $ 500
Let x be the number of weeks.
The according to the question , we have
[tex]500x+340\geq850\\\\\Rightarrow\ 500x \geq850-340\\\\\Rightarrow\ 500x \geq510\\\\\Rightarrow\ x \geq\dfrac{510}{500}\\\\\Rightarrow\ x \geq1.02[/tex]
i.e. x=2
So, it will take 2 weeks to have $850.