Ok, so let's take a look at how much Jordan would have at the end of 1 year with each job.
Job 1. 4200 x 12 = 50400. 50400 + 4500 = 54900. At the end of one year, Jordan would have $54900.
Job 2. 3100 x 12 = 37200. 37200 + 500 = 37700. At the end of the year, Jordan would have been paid $3770. BUT (assuming the trend is paid monthly) that's also 600 x 12 = 7200. 37700 + 7200 = 44900. In the end, Jordan will have $44900.