Question

1. what number is 30% of 150? 30%=0.3 0.3×150 = 45 4. a recipe uses 3 cups of flour for 8 cupcakes. how much flour do you need for 20 cupcakes? 5. a car salesman earns a 6% commission on $12,000. how much does he earn in commission?

Explanation:

3.

Step1: Convert percentage to decimal

$30\% = 0.3$

Step2: Calculate the number

$0.3\times150 = 45$

Step1: Set up proportion

Let $x$ be the amount of flour for 20 cupcakes. The proportion is $\frac{3}{8}=\frac{x}{20}$.

Step2: Cross - multiply

$8x=3\times20$
$8x = 60$

Step3: Solve for $x$

$x=\frac{60}{8}=\frac{15}{2}=7.5$

Step1: Convert percentage to decimal

$6\%=0.06$

Step2: Calculate the commission

$0.06\times12000 = 720$

Answer:

$45$

4.