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Chapter 3 Review
Contributed by: Lujan

  Chapter 3 Review

Apply Proportionality

      to Percents

15 is 15% of what number?

X =

is

of

=
=

    %

100

100

8 is what percent of 64?

X =

is

of

=
=

    %

100

100
%

What is 25% of 80?

X =

is

of

=
=

    %

100

100

6% of 40 is what number?

X =

is

of

=
=

    %

100

100
total cost =$
+ meal =$

Tom went to lunch which cost $6.95 and

will leave a 20% tip.  What will be the

total cost to the nearest cent?

tip =$

 tip

total

=
=

    %

100

100
- discount =$
total cost =$

Jerry went to Sports World to buy a bat.  The bat

was priced at $30 with a 15% discount.  Determine

 the sales price to the nearest cent. 

price =$

 discount

    total

=
=

    %

100

100
written with cents

Determine the simple interest paid to the nearest cent

for each principal (p), rate (r), and time (t).

interest =$

Interest = principal x rate x time
I = prt

principal = $1400

rate = 3.8 %

time = 1 year

(loan)
x

(decimal)

x

(years)

Determine the simple interest paid to the nearest cent

for each principal (p), rate (r), and time (t).

interest =$

Interest = principal x rate x time
I = prt

principal = $628

rate = 5 %

time = 4 months

(loan)
x

(decimal)

x
12

(years)

 

9

36

36  9.00
0.25
25 %

Determine the percent of change. Round to the nearest

whole percent. State whether the percent of change

is an increase or decrease.

75-25

$75 to $25

difference

 original

=
original  difference

increase

decrease

%

Chris estimated that would spend $250 on new summer

clothes. She actually spent $350. What was the percent

of change? Round the nearest whole percent.

350-250

difference

 original

=
original  difference
decrease

increase

%
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