So, the answer is not clear. There is no certain amount, only greater than a certain value. The first choice has $800, and the second one had $475 plus 8 percent commission. The initial salary difference is $325, so he needs to make more than $325 from 8 percent. To find out an exact a threshold, we have to use proportions.
8/100 = 325/x is what you should use. Calculating it, you get a threshold of $4,062.50. This is the exact amount needed to balance out the two. He needs more than $4,062.50. The inequality for this would be,
x > $4062.50. I hope I got the question right, and sorry for over explaining, hope you get it now.
