The radius of a given circle is increased by 20%. What is the percent increase of the area of the circle.

Cindy is running for student body president and is making circular pins for her campaign. She enlarges her campaign image to fit the entire surface of a circular pin. After the image is enlarged, its new diameter is 75 percent larger than the original. By approximately what percentage has the area of the image increased?

A stock for YUM was trading at . If the price increased by , then decreased by , then increased by ; what was the net % change in price (to the nearest tenth of a percent)? (use a negative sign to denote a decrease)

The population of Town A is 12,979 people in 1995. The population, when measured again in 2005, is 22,752. What was the change in population to the nearest whole percentage point?

A factory produced 2500 units during the month of September. In order to increase production by 12% in the month of October, the factory hired more workers. How many units were produced in October?

Phoenicia is a grocery store that is expanding quickly.

In 2011 Phoenicia's total sales were $1,800,800.

In 2012 their sales rose to $2,130,346.

By what percentage did the store increase its income from 2011 to 2012.

(Round answer to the nearest tenth.)

If the side of a square is doubled in length, what is the percentage increase in area?

A circle has its radius increased by . By what percent is its area increased?