Luttrell 2012
72
Chapter 4 Test, continued
7. Answer each part:
a. What is 40% of 70?
b. What is 25% of 40?
c. Fifteen is 10% of what number?
d. Sixteen is 25% of what number?
e. Write as a percentage: 7 girls in a class of 18 students.
8. A city recycles 78% of the newspapers sold there. The Chronicle Herald has a readership of
316,700. How many of the Chronicle Herald gets recycled?
9. It costs you $25 to make a sweater and want to sell it for profit at $45. What percent markup
do you have (percent increase)?
10. SLA has 73 students and is praying for 100 next year. What is the percent increase?
11. Answer the following short questions:
a. Write as standard form: 2.34×10
5
.
b. Write as a sum of powers: 300.04.
c. Write as standard form: 6(10
3
) + 3(10
2
) + 4(10
0
)
d. Simplify: 3-3×2
3
∕4 – 3
e. Evaluate 3x
2
– 4x + 1 when x = -1.
Bonus: (5pts) Two identical jars are filled with equal number of marbles. The marbles are
colored red or white. The ratio of red to white in jar I is 7:1 and 9:1 in jar II. If there are 90
white marbles all together, how many red marbles are in Jar II?
10
5
5
5
5