Calculating Percentages and Revenue

This video tutorial covers four essential tricks for solving percentage questions on the GRE. It includes methods for quickly finding percentages, increasing and decreasing numbers by a percentage, and determining one number as a percentage of another. The tutorial emphasizes using decimals for efficiency and provides practical examples to enhance understanding and speed in solving these types of questions.

What is the main focus of the video tutorial?

• Advanced algebra techniques

• Common percentage problems on the GRE

• Basic arithmetic operations

• Geometry concepts

Which method is NOT recommended for finding a percentage?

• Using decimals

• Using fractions

• Using division and multiplication

• Using a calculator

How can you quickly find 21% of 240?

• Divide 240 by 100 and multiply by 21

• Multiply 240 by 0.21

• Multiply 240 by 21

• Subtract 21 from 240

What is the benefit of using the right-hand side of the keyboard during the test?

• It is mandatory

• It saves time for some people

• It is more accurate

• It helps in typing faster

To increase a number by 12%, you should multiply by:

• 1.12

• 0.88

• 0.12

• 12

If you want to increase a number by 15%, what should you multiply by?

• 15

• 0.15

• 0.85

• 1.15

Why can't you simply add percentages when increasing a number by two different percentages?

• All of the above

• It leads to incorrect results

• It is mathematically incorrect

• Percentages are not additive

To decrease a number by 12%, you should multiply by:

• 1.12

• 0.12

• 1.88

• 0.88

What is the first step in decreasing a number by a percentage?

• Add the percentage to 100

• Multiply by the percentage

• Subtract the percentage from 100

• Divide by the percentage

How do you find what percentage one number is of another?

• Add the two numbers

• Multiply the two numbers

• Divide the first number by the second and multiply by 100

• Subtract the second number from the first