**Q6: **

Find the percentage change from $835 to $690. Round to the nearest whole percent.

**Q7: **

Increase 40 by .

**Q8: **

Determine, to the nearest cent, the total price of a chair that costs $14.82 after a sales tax of is added.

**Q9: **

A pair of headphones costs $100 at a store. Another store sells the same pair for $159. Determine the percentage increase in the price at the second store.

**Q10: **

Decrease 45 by .

**Q11: **

Increase 45 by 12%.

**Q12: **

When Mason was 9 years old, he was 49 inches tall. He is now 12 years old and 56 inches tall. Determine, to the nearest tenth, the percentage increase in his height.

**Q13: **

Decrease 450 by .

**Q14: **

A mobile app, whose regular price is $11.43, is on sale at a discount of . Find the sale price to the nearest cent.

**Q15: **

A road has 7 lanes. Determine, to the nearest whole percent, the percentage change in the number of lanes if an extra lane is added in each direction.

**Q16: **

Scarlett ordered a TV set online. The set cost $1 629 in addition to a sales tax of . Determine, to the nearest cent, the total amount she paid.

**Q17: **

The annual video game sales for a company were $37.5 billion last year. If sales are expected to increase by , determine the projected amount of sales in the coming year.

**Q18: **

What is the percentage change of 34.4 grams to 26.6 grams? Round the answer to the nearest whole percent, and then state whether this change is an increase or a decrease.

- A , increase
- B , decrease
- C , increase
- D , decrease
- E , increase

**Q19: **

Using the given graph, determine between which two years the percent of increase in the number of trucks sold was the greatest, and give its value to the nearest whole percent.

- Abetween 2003 and 2004,
- Bbetween 2004 and 2005,
- Cbetween 2003 and 2004,
- Dbetween 2004 and 2005,
- Ebetween 2004 and 2005,

**Q20: **

Decrease 42 by .

**Q21: **

The headphones that David wants originally cost $277. Yesterday, they were off and his grandmother bought them for him because she gets an additional off with her senior citizen discount. David has to pay his grandmother back half the amount she spent. How much does he owe her?

**Q22: **

Last month, the total amount of David’s expenses was $2 650. His mortgage is due this month, so he expects his total expenses to be of the amount spent last month. Determine the amount of money David is expected to spend this month.

**Q23: **

Determine, to the nearest whole percent, the percentage change of 37.6 months to 50.9 months, and state whether the percentage change is an increase or a decrease.

- A , decrease
- B , increase
- C , decrease
- D , increase
- E , decrease

**Q24: **

Determine, to the nearest whole percent, the percentage change of to , and state whether the percentage change is an increase or a decrease.

- A , decrease
- B , increase
- C , decrease
- D , increase
- E , decrease

**Q25: **

The costs of two different video games decreased by $9. The original cost of the first game was $49, and the original cost of the second one was $43. Which game had the greater percent of decrease?

- Athe second game
- Bthe first game