Given:
a.) A dealer buys a car from the manufacturer for $21,050.
b.) He sells it for $30,038.
Let's now determine his markup,
We get,
[tex]\text{ Mark up (\%) = }\frac{\text{ \$30,038 - \$21,050}}{\text{ \$21,050}}\text{ x 100}[/tex][tex]=\text{ }\frac{\text{ \$8,988}}{\text{ \$21,050}}\text{ x 100}[/tex][tex]=\text{ 0.42698337 x 100}[/tex][tex]\text{ }=\text{ 42.698337 \%}[/tex][tex]\text{ Mark up }\approx\text{ 42.70\%}[/tex]Therefore, the mark up is 42.70%