# Would you expect study time to be subject to diminishing returns?

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Learning Goal: I’m working on a micro economics question and need an explanation and answer to help me learn.
Q1. Compute the percentage changes for the following (enter your responses as integers):
(3 Marks) [Ch. 1]
Initial Value
New Value
Percentage Change
100
112
50
54.0
10
12.5
Q2. Maps are a good non-economic example of using assumptions to make things simpler. Which of the following are assumptions used to make maps useful?
(2 Marks) [Ch. 1]
Q3. Consider a student studying for a biology exam. Would you expect study time to be subject to diminishing returns? Suppose productivity is measured as the anticipated increase in the exam score. Construct a numerical example in which the first hour is twice as productive as the second hour, which is twice as productive as the third hour, and so on up to five hours of study. (2 Marks) [Ch. 2]
Q4. If the florist below shows the marginal benefit that a florist earns from keeping his store open one more hour. The florist has a marginal cost of &70 per hour. For the last five weeks he has stayed open 24 hours.
Hours
Marginal Benefit per Hour
18
100
19
80
20
70
21
60
22
30
23
20
24
10
a. Do you think the florist’s decision to stay open 24 hours is optimal? Why?
(1.5 Marks) [Ch. 2]
b. How many hours do you advise him to stay open? Why? (1.5 Marks) [Ch. 2]
Q5. If the demand and supply curves for boxes are: D = 100 – 8P and S = 22 + 4P, where P is the price of boxes.
a. Does the law of supply apply for the market of boxes? Why? (3 Marks)
b. Calculate the equilibrium quantity and price? (2 Marks)
[Ch. 3]

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