whatever% of anything is just (whatever/100) * anything.
now, we know Trever makes $500 in salary and 2% on sales, let's say he sells "x" amount, how much is 2% of x? well (2/100) * x, or 0.02x.
Therefore Trever's earnings are 500 + 0.02x, his salary plus his commission.
to earn a total of 2,000, then 500 + 0.02x = 2000, thus
[tex]\bf 500+0.02x=2000\implies 0.02x=1500\implies x=\cfrac{1500}{0.02}\\\\\\ x=75000[/tex]
