Difficult# Car Salesmen Earnings

SATMAT-XUYVOY

Mark and Jordan are car salesmen. Mark's weekly compensation consists of ${\$500}$ plus ${2.5}{\%}$ of the total amount of his sales for the week. Jordan's weekly compensation consists of ${\$400}$ plus ${2}{\%}$ of the total amount of his sales for the week. Jordan had $ x $ dollars in total sales last week.

If $ D = \left[ \left( .025 \right) \left( 1.5x \right) +500 \right] -\left[ \left( .02 \right) \left( x \right) +400 \right] $ represents the DIFFERENCE between Mark’s compensation and Jordan's compensation for the week, then which of the following is a correct statement?

(Calculator)