Since they are asking the hours worked to make AT LEAST $200 then our answer needs to be greater than or equal to (>=) 200. If he makes 15 an hour and works x hours...
15 Ă— x >= 200
15x >= 200
x >= 200/15
x >= 13.33
So he must work AT LEAST 13.33 hours to make AT LEAST 200 dollars.