Help with algebra (inequalities) question

Question

Two girls want to start a lawn mowing business for the summer. They plan to buy a power mower for $200, and they hope to charge $8.50 an hour. 

 

Determine how many hours the girls will have to work to make more than $200 for the summer

 

 

So far I only have 8.50h - 200  I'm confused on how to set this up.

Answer 1

Number of hour they work =h

 

amount they earn in h hour = 8.50 h

 

8.50 h -200  > 200

 

add 200 to both side

 

8.50 h >400

 

divide by 8.50 to both side

 

h >47.06

 

So they have to work more then 47.06 hours to get more than $200