SAT Practice 5: Percents
CHAPTER 7 / ESSENTIAL PRE-ALGEBRA SKILLS 289
- David has a total of $3,500 in monthly
expenses. He spends $2,200 per month on rent
and utilities, $600 per month on clothing and
food, and the rest on miscellaneous expenses.
On a pie graph of his monthly expenses, what
would be the degree measure of the central
angle of the sector representing miscellaneous
expenses?
(A) 45° (B) 50° (C) 70°
(D) 72° (E) 75° - In one year, the price of one share of ABC
stock increased by 20% in Quarter I, increased
by 25% in Quarter II, decreased by 20% in
Quarter III, and increased by 10% in Quarter
IV. By what percent did the price of the stock
increase for the whole year? (Ignore the %
symbol when gridding.)
5. The cost of a pack of batteries, after a 5% tax,
is $8.40. What was the price before tax?
(A) $5.60
(B) $7.98
(C) $8.00
(D) $8.35
(E) $8.82
6. If the population of Town B is 50% greater
than the population of Town A, and the popu-
lation of Town C is 20% greater than the pop-
ulation of Town A, then what percent greater
is the population of Town B than the popula-
tion of Town C?
(A) 20% (B) 25% (C) 30%
(D) 35% (E) 40%
7. If the length of a rectangle is increased by 20%
and the width is increased by 30%, then by
what percent is the area of the rectangle
increased?
(A) 10% (B) 50%
(C) 56% (D) 65%
(E) It cannot be determined from the given
information.
8. If 12 ounces of a 30% salt solution are mixed
with 24 ounces of a 60% salt solution, what is
the percent concentration of salt in the mixture?
(A) 45% (B) 48% (C) 50%
(D) 52% (E) 56%
9. The freshman class at Hillside High School
has 45 more girls than boys. If the class has n
boys, then what percent of the freshman class
are girls?
(A) (B)
(C) (D)
(E)
100 45
45
n
n()+
+
%
100 45
245
n
n()+
+
(^100) %
245
n
n+
%
n
n+
+
45
245
%
n
n+ 45%
....1 2 3 4 5 7 8 9610 2 3 4 5 7 8 9610 2 3 4 5 7 8 9610 2 3 4 5 7 8 96- On a two-part test, Barbara answered 60% of
the questions correctly on Part I and 90% cor-
rectly on Part II. If there were 40 questions on
Part I and 80 questions on Part II, and if each
question on both parts was worth 1 point,
what was her score, as a percent of the total?
(A) 48% (B) 75% (C) 80%
(D) 82% (E) 96% - If xis of 90, then 1 −x=
(A) − 59 (B) − 5 (C) 0
(D) 0.4 (E) 0.94