Quiz 3 answer key
Math 1030-005 (Fall 2014)
1. of / more than / less than (4 points)
(1) Will is 22% taller than Wanda, so Will’s height is 122 % of Wanda’s height.
(2) The wholesale price of a TV is 20% less than the retail price. Therefore, the whole sale price
is 0.8 times the retail price.
2. Find the absolute change and the percentage change (relative change) in the following case.
(Absolute change = new value − reference value (old value); relative change = absolute change /
reference value × 100%) (4 points)
The number of daily newspapers in the US was 2000 in 1912 and 1500 in 2006.
absolute change = -500
relative change = -500 / 2000 = -25%
3. Express the following numbers in scientific notation. (a×10b , 1 ≤ a < 10, b is an integer) (4 points)
(1) 2,014,923 = 2.014923 × 106 ≈ 2.015 × 106 ≈ 2 × 106
(2) 0.00015 = 1.5 × 10−4
End of Quiz