Bell Quiz. Objectives Solve problems involving percents. Write proportion and percent statements.

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Presentation transcript:

Bell Quiz

Objectives Solve problems involving percents. Write proportion and percent statements.

Percent A percent is a ratio that compares a number to 100. For example, 50% is the ratio 50/100. There are three components that form a percent statement. – The whole is the total amount – The percent is a rate that quantifies and amount measured with respect to the whole. – The percentage is a number that represents a percent of the whole. – If two of the components are known, then the third component can be determined.

Example 1 Using an Equation to Find a Percentage What number is 25% of 50?

Example 2 Using an Equation to Find a Percentage What number is 125% of 64?

Lesson Practice What number is 35% of 70?

Lesson Practice What number is 150% of 24?

Percent A percent statement can be set up as a proportion. One ratio compares the part of a quanity to the whole quantity. The other ratio is the percent rate written in the form of a ratio.

Percent For example 10% of 50 is 5 can be written as proportion.

Example 3 Using a Proportion What number is 125% of 48?

Example 4 Using a Proportion 15 is what percent of 45?

Lesson Practice Using a proportion, find 315% of 21

Lesson Practice 59.5 is what percent of 17?

Example 5 Application: Calculating Wages Ana receives $ in gross earning every two weeks. However, 28.07% of the gross earnings are removed from taxes and other deductions. Using an equation, determine the net pay.

Lesson Practice A driver who accelerates quickly and brakes heavily reduces his car’s fuel economy by as much as 33%. The car is supposed to get 32 miles per gallon. Using an equation, find the actual fuel economy of the car.

Example 6 Application: Finances Dominic earn $9.25 and hour working part-time. The Circle graph shows how he divides his earning. This month Dominic has worked a total of 54 hours. Find the amount of Dominic’s earnings that will be put into savings this month.

Lesson Practice A school raised $15,432 for a new computer lab. The money will be allotted as follows: 50% for construction costs, 45% for technology purchases, and 5% for incidental expenses. Using a proportion, find the amount that will be spent on technology purchases.