Percent Proportion Word Problems

solve this proportion.

$$\frac{x}{120}=\frac{92}{100}$$

What is the closest to the amount of games they won

What percent of the class are girls?

$$\frac{12}{30}=\frac{x}{100}$$

How many total students attend this school?

$$\frac{321}{x}=\frac{80}{100}$$

Natalie spends 40% of her monthly salary on rent. She earns $1,500 each month. How much does she spend on rent?

A penny weighs 2,500 milligrams. Pennies used to be made of pure copper, but today's pennies only contain 2.5% copper. How many milligrams of copper are in a penny?