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This is all in the book and you should have already done a homework assignment from section 3.10

Remember: of means times. is means equals. Percentages must be turned into decimals when used in an equation and turned back into a percentage from a decimal when the question asks for one.

What percent of 59 is 23.6?

• x times 59 = 23.6
• Divide both sides by 59
• x=0.4 which means the percentage is 40% (decimal moved two spots to the left).

63.8 is 110 percent of what number? (must turn 110 into a decimal!!)

• 63.8=1.10 times x
• Divide both sides by 1.10
• 57.3 = x (answer has been rounded from 57.272727...)

What is 94 percent of 36?

• x=0.94 times 36
• x=33.84

What is 2/5 of 20?

• x=2/5 times 20
• you can either multiply 2/5 times 20 and get 40/5 OR turn 2/5 into the decimal .4 and multiply it times 20
• either way you get x=8