MTH215T Wk 5 - Final Exam Answers

All Answers in Bold Are Correct

Question 1

/ 10

Renting a car costs $30 per day, or $600 per month. Renting daily is cheaper for a few days, but after how many days are the two options equal (after which renting monthly is cheaper)?

20 Correct Answer

· Question 2

/ 10

After several years of working, Katy has savings of $100,000. If she invests that $100,000 in a savings fund that adds 5% each year, about how much will her savings account have after 20 years? Ignore compounding and taxes, and assume Katy puts no additional money into savings.

$105,000

$120,000

$150,000

$200,000 Correct Answer

· Question 3

/ 10

A goal is to get at least 10% of daily calories from polyunsaturated fats as are found in various nuts, oils, and fish. One serving of walnuts (about 15 pieces) has about 20 g of polyunsaturated fat. Each fat gram has 9 calories. About what percent of daily calories does one serving of walnuts provide, assuming a 2,000-calorie diet?

4.5%

9% Correct Answer

18%

· Question 4

/ 10

A hiker is told to carry 2 cups of water for every 10 minutes spent walking. The hiker plans to hike for 60 minutes. How many cups of water should the hiker carry?

6 cups

10 cups

12 cups Correct Answer

20 cups

· Question 5

/ 10

At the start of a year, company XYZ’s stock is $40 per share. At the end, the company’s stock is $60 per share. What was the stock price’s rate of return (percent increase)?

20%

40%

50%

60%

· Question 6

/ 10

A particular extension cord can support up to 8 amps. Mo has an iron whose label states 1,200 watts and wonders if the iron can be plugged into the extension cord. If watts are converted to amps by dividing by 120, how many amps does the iron use?

1 amp

10 amps

100 amps

120 amps

· Question 7

/ 10

A tennis lesson lasts from 9:00 a.m. to 10:00 a.m., and should include an 8-min break with equal time before and after the break. At what time should the break start?

9:22 a.m.

9:24 a.m.

9:26 a.m.

9:28 a.m.

· Question 8

/ 10

Maria has a 30-minute work break. During the break, she’ll walk 3 minutes to another floor, say hello to 4 different friends spending equal time with each, and walk back for 3 minutes. How long can she spend with each friend?

4 min

5 min

6 min

7 min

· Question 9

/ 10

A restaurant bill is $80. Juan leaves a $20 tip. What percent tip is that?

15%

20%

25%

30%

· Question 10

/ 10

Sal bought 2 shirts and a hat. Sal remembers each shirt was $10, and the total was $50. Which equation helps answer the question: How much were the hat?

10 + x = 50

10 + 10 + x = 50

x = 50 + 10

10 + 10 = 50 + x

· Question 11

/ 10

A shirt is on sale for 20% off. Sandy paid $8 for the shirt. What was the shirt’s regular price?

$10

$12

$16

$20

· Question 12

/ 10

Flo sets a goal of walking 10,000 total steps per day. Flo’s normal routine involves walking 4,000 steps per day. If Flo walks 100 steps per minute, how many extra minutes should she walk per day beyond her normal routine?

100

140

· Question 13

/ 10

A family’s monthly utility costs are: phone $200, electric $100, cable TV $100, water/gas $50, internet $50. By eliminating cable, by what percent does the family reduce total utility cost?

20%

25%

30%

50%

· Question 14

/ 10

Kim’s business earns $10,000 per month. Kim’s non-employee expenses are $3,000 per month. If Kim wants $2,000 in profit per month, how many employees can Kim have if each employee costs $1,000 per month?

· Question 15

/ 10

What is wrong with the following equation: 4 + (10 / 5) = 6 – 2

Equations should not involve expressions on both sides.

The equation mixes different operations like +, /, and -.

The left side’s expression is longer than the right side.

The two sides do not evaluate to the same value.

· Question 16

/ 10

A laptop computer consumes about 20 watts of electricity per hour when operating. At 10 cents per kilowatt-hour, how much does a laptop cost to operate for 5 hours?

1 cent

50 cents

200 cents

1,000 cents

· Question 17

/ 10

Ken wants a $1,000 TV/sound system. He can’t afford that amount, so he uses a credit card with 20% annual interest. If he only pays the interest each month on that credit card debt, about how much will he pay in interest in 4 years?

$200

$400

$600

$800

· Question 18

/ 10

A family has a phone plan that includes 4 GB of data per month. 10 days into a 30-day month, the family has used 1 GB. At that rate, how many GB will the family use for the entire month?

2 GB

3 GB

4 GB

5 GB

· Question 19

/ 10

A mirror should be centered on a wall. The mirror is 4 feet wide and the wall is 20 feet wide. Which equation helps determine the distance x on each side of the mirror?

x + 4 + x = 20

4 + x + 4 = 20

x = 20 + 4 + 4

4 = 20 + x + x

· Question 20

/ 10

Lee put $10,000 into a stock market index mutual fund that grew at an average of 7% per year for 10 years. About how much is in Lee’s mutual fund account after 10 years? Ignore compounding.

$10,070

$10,700

$17,000

$70,000