I don’t know sorry but hope you get the answer

The Cost of one case of soda is ~

The solution is in attachment ~
We simply take the amount he needs no earn ($500) subtract what he gets for each sale ($50) and divide with the percentage he gets (2% = 0.02)
500-50 = 450
450/0.02 = 22500
The salesperson has to sell a car for $22500 in order to earn $500 himself