Percentage Calculations and Applications

This lesson by Kirk Weiler covers unit 4, lesson 5 on percentages, decimals, and calculator use. It explores the relationship between percentages, fractions, and decimals, and demonstrates how to use calculators for complex calculations. Exercises include calculating percentages of totals, tax and tip, pay raises, temperature changes, and price fluctuations. The lesson emphasizes converting percentages to decimals and using them in real-world applications.

What is the main focus of the lesson introduced by Kirk Weiler?

• Understanding algebraic expressions

• Exploring geometry concepts

• Learning about percentages, decimals, and calculators

• Studying probability and statistics

In the pet shelter example, what fraction of the animals were cats if 65% were cats?

• 13/20

• 65/100

• 3/5

• 7/10

How do you convert 65% to a decimal?

• 65.0

• 6.5

• 0.65

• 0.065

What is the sales tax amount on a $54 bill with an 8% tax rate?

• $6.48

• $3.24

• $5.40

• $4.32

If Amara wants to leave a 15% tip on a $58.32 bill, how much should the tip be?

• $8.75

• $7.50

• $9.00

• $8.00

Tristan receives a 12% raise on his $720 salary. How much is his raise?

• $80.00

• $90.00

• $72.00

• $86.40

Naomi's salary is $985, and she gets an 8% raise. What is the dollar amount of her raise?

• $98.80

• $68.80

• $88.80

• $78.80

What is the temperature of the coffee after it decreases by 26% from 190°F?

• 140.6°F

• 150.6°F

• 160.6°F

• 130.6°F

If gasoline price increases by 15% from $3.40, what is the new price?

• $3.91

• $4.00

• $3.85

• $3.75

Why doesn't the gasoline price return to the original after a 15% increase and then a 15% decrease?

• Inflation adjustments

• Incorrect percentage calculations

• Different base amounts for percentage calculations

• Rounding errors