Handout 1b – Key to Mathematic Diagnostic
EC 100
The following handout is a diagnostic test of the mathematic skills needed for Economics 100
and 101.
If you get more than 5 wrong, I strongly suggest that you read the appendix at the end
of the textbook.
1.
2*12 + 4
=
24 + 4 =
28
.
2.
What % of 30 is 6?
6/30 = 1/5 = 0.20 or
20%
.
3.
How much is 25% of 4?
25% is 0.25
=>
4*(0.25) =
1
4.
If the price increases 50% from $10, how much is it?
A 50% increase is $10*0.5 = $5.
The
new price would be $10 + $5 =
$15
.
5.
Suppose that the price index increases from 50 to 55.
The growth rate or percentage change
in the price index is (5550)/50 = 5/50 =
0.10 or 10 percent
6.
Suppose that the price index increases from 70 to 75.
The growth rate or percentage change
in the price index is (7570)/70 = 5/70 =
0.07 or 7 percent
7.
1/2 divided by 1/4
=
1
4
2
1
2
4
==
2
.
8.
If X = 6X 2, what is X?
isolate X on one side
=>
5X = 2
=>
X = 2/5
.
9.
X = (1/2)X + 6, what is X?
isolate X on one side
=>
(1/2)X = 6
=>
X = 12
.
10. What is the slope of the line Y = 10 + 2X?
The slope is
2
.
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 Fall '07
 Kasilwal
 Economics, Macroeconomics, $5, $15, vertical intercept, Mathematic Diagnostic

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