This video reviews how to find the percentage of a given number using the percentages given from a pie chart.

To find the percentage of a number multiply the number by the percentage which must be expressed as a decimal or fractional value.  Although you may solve by expressing the percentage a decimal or a fraction, this video will focus on using a decimal value.
 
Example:  What is 45% of  160? ------------> 0.45 x 160 = 72