IM 7.6.12 Practice: Solving Problems about Percent Increase or Decrease

A backpack normally costs $25 but it is on sale for $21. What percentage is the discount?

Find each product.

[math]\frac{2}{5}\cdot\left(-10\right)[/math]

[math]-8\cdot\left(\frac{-3}{2}\right)[/math]

[math]\frac{10}{6}\cdot0.6[/math]

[math]\left(\frac{-100}{37}\right)\cdot\left(-0.37\right)[/math]

Select [b]all[/b] expressions that show [math]x[/math] increased by 35%.

[math]1.35x[/math] [math]\frac{35}{100}x[/math] [math]\left(100+35\right)x[/math] [math]\frac{100+35}{100}x[/math] [math]\left(1+0.35\right)x[/math] [math]x+\frac{35}{100}x[/math]

Complete each sentence with the word discount, deposit, or withdrawal.

Clare took $20 out of her bank account. She made a _____.

withdrawal discount deposit

Kiran used a coupon when he bought a pair of shoes. He got a _____.

discount deposit withdrawal

Priya put $20 into her bank account. She made a _____.

discount withdrawal deposit

Lin paid less than usual for a pack of gum because it was on sale. She got a _____.

deposit discount withdrawal

The initial freshman class at a college is 10% smaller than last year’s class. But then during the first week of classes, 20 more students enroll. There are then 830 students in the freshman class.

Which equation matches this story?

[math]0.9x+20=830[/math] [math]0.9\left(x-20\right)=830[/math]

Solve the equation you chose, and explain what the solution means in the situation.

A store reduces the price of a computer by $20. Then during a 10% off sale, a customer pays $830.