Problem Solving
1. In July the price of a stock increased by 10 percent. In
August, it declined by 20 percent. If in September the price
increased 10 percent, by what percentage of the original July
price has the stock changed in price from the start of July to
the end of September?
(A) 0 percent
(B) 3.2 percent
(C) 4.4 percent
(D) 20 percent
(E) 40 percent
2. Which of the following is 850 percent greater than 8 x
103?
(A) 8.5 x 103
(B) 6.4 x 104
(C) 6.8 x 104
(D) 7.6 x 104
(E) 1.6 x 105
3. A vending machine dispenses gumballs in a regularly
repeating cycle of ten different colors. If a quarter buys 3
gumballs, what is the minimum amount of money that must be spent
before three gumballs of the same color are dispensed?
(A) $1.00
(B) $1.75
(C) $2.00
(D) $2.25
(E) $2.50
4. If a dealer had sold a stereo for $600, he would have made
a 20% profit. Instead, the dealer sold it for a 40% loss. At what
price was the stereo sold?
(A) $300
(B) $315
(C) $372
(D) $400
(E) $440
5. A butcher buys 240 kilograms of beef for $380. If 20
percent of the beef is unusable, at approximately what average
price per kilogram must he sell the rest of the beef in order to
make a profit of 25 percent?
(A) $2.30
(B) $2.40
(C) $2.45
(D) $2.47
(E) $2.55