math uint 2 quiz 3

If $400 is invested at the rate of 6% for one year, what will be the total value of the investment (the amount)?

$424.00

If a man earns $420 interest in one year at 7%, what was the amount of money invested?

$6,000.00

What is the sale price of a cell phone that is on sale for 15% off if the regular price is $75?

$63.75

$3,000 is invested in an account paying 4% interest and twice that amount is invested at 6%. Which of the following expressions represents the amount of interest earned on the money invested at 6%?

0.06(6,000)

A certain bleach is 5% active ingredients. In 10 gallons of this bleach, how much is active ingredients?

0.5 gallons

How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution?

15 L

What is the greatest possible error when measuring to the nearest quarter of an inch?

18in

The amount of a chemical solution is measured to be 2 liters. What is the percent error of the measurement?

25%

Select all of the following that are equivalent to 60%.

3/5 0.6

The temperature dropped from 75 degrees to 50 degrees. What was the percent decrease in the temperature?

33%

40 is what percent of 50?

80%

Chocolates costing $8 per pound are to be mixed with chocolates costing $3 per pound to make a 20 pound mixture. If the mixture is to sell for $5 per pound, how many pounds of each chocolate should be used?

8x + 3(20 - x) = 5(20)

Which of the following will convert a fraction to a decimal?

Divide the numerator by the denominator.

What number is 32% of 75?

n = 0.32(75)