8) 12 is 30% of some number, which we'll call x. We can write the percent as a decimal and solve for x
[tex]0.3x=12 \\ \\ x = 40[/tex].
The answer is 40.
9) 45% of 20 is [tex]0.45(20)=9[/tex].
The answer is 9.
10) 18 is [tex](18/30 = 60)[/tex]% of 30.
The answer is 60%.
11) 56 is 80% of some number x. We write
[tex]0.8x=56 \\ \\ x = 70[/tex].
The answer is 70.
12) If the total cost on an item that costs $4.00 is $4.32, then the tax is 32¢. We want to find the percent of the total 4 that is .32. [tex] \frac{0.32}{4} = 0.08=8[/tex]%.
The answer is 8%.
