The perimeter $P$ (in yards) of a soccer field is represented by the formula $P=2l+2w$ , where $l$ is the length (in yards) and $w$ is the width (in yards). A drawing shows a soccer field with its length labeled 100 yards and perimeter labeled 330 yards. The radius of the center circle is labeled 10 yards. a. Solve the formula for $w$ . $w=$ b. Find the width of the field. Width: yards c. About what percent of the field is inside the circle. Round to the nearest tenth of a percent. About %.