Proportionality Lesson with Percents

A music store marks up the instruments it sells by 30%. If the store bought a guitar for $45, what will be its store price?

A music store marks up the instruments it sells by 30%. If the price tag on a trumpet says $104, how much did the store pay for it?

A music store marks up the instruments it sells by 30%. If the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?

A family eats at a restaurant. The bill is $42. The family leaves a tip and spends $49.77. How much was the tip in dollars?

A family eats at a restaurant. The bill is $42. The family leaves a tip and spends $49.77. How much was the tip as a percentage of the bill?

The price of gold is often reported per ounce. At the end of 2005, this price was $513. At the end of 2015, it was $1,060. By what percentage did the price per ounce of gold increase?

For diagram A, decide if $$y$$ is an increase or a decrease of $$x$$ .

For Diagram A, what is the percentage change from $$x$$ to $$y$$ ?

For diagram B, decide if $$y$$ is an increase or a decrease of $$x$$ .

For Diagram B, what is the percentage change from $$x$$ to $$y$$ ?