Solve a Net Change Problem.

The marginal profit function for Boblin the Goblin dolls $is$ given $by$

$P^{\text{'}}(x)=130+\frac{5}{x+6}+\frac{x^2}{10}$

dollars per doll when $x$ dolls are sold. Find the change $in$ profit when the number $of$ dolls

sold increases from $50to55.$

The net change $in$ profit $is$

dollars $(roundto$ the nearest cent$).$