Solving Percent Problems Effectively

The video tutorial covers solving percent problems using two main methods: proportions and equations. It begins with a review of inverse operations in algebra, then introduces solving percent problems using the 'is over of equals percent over 100' method and the 'part over whole equals percent over 100' method. The tutorial also demonstrates solving percent problems by setting up equations, explaining how 'is' means equals and 'of' means multiply. An example of calculating sales tax is provided to illustrate these methods in a real-world context.

What is the result of solving the equation 4X = 90?

• 24.5

• 25.5

• 23.5

• 22.5

Which method is introduced for solving percent problems?

• both methods

• is over of equals percent over 100

• part over whole equals percent over 100

• none of the above

In the proportion method, what does the 'is' value represent in the equation 'what percent of 40 is 25'?

• 40

• 25

• X

• 100

What is the percentage result of solving 'what percent of 40 is 25' using the proportion method?

• 75%

• 50%

• 62.5%

• 80%

How do you set up the equation for '15 is 25% of what number'?

• X = 15 * 0.25

• X = 15 / 0.25

• 15 = X / 0.25

• 15 = 0.25 * X

What is the result of solving '35 equals 0.28 times what number'?

• 120

• 110

• 125

• 100

How do you convert a decimal value to a percentage?

• Divide by 100

• Divide by 10

• Multiply by 100

• Multiply by 10

What is the percentage result of solving 'what percent of 9 is 18'?

• 250%

• 150%

• 200%

• 100%

What is the sales tax rate if the tax is $18 on a $225 DVD player?

• 6%

• 7%

• 8%

• 9%

Which method can be used to solve '18 is what percent of 225'?

• is over of equals percent over 100

• setting up an equation

• both methods

• none of the above