Answers
Answer 1 : Equilibrium price and Quantity
Q d = Q s
3+5P= 63-15P
60= 20P
P=$3
Q= 3+5P= 3+5(3)= 18 units
Answer 2: P= -5+3Q s
P= 50-2Q d
Q s =( P+5)/3
Q d = (50-P)/2
Q d = Q s
(50-P)/2 = ( P+5)/3
150-3P= 2P+10
140= 5P
P= $28
Q= 11units
Answer Using elasticity:
1. Elasticity of demand ( E d)= % change in quantity demanded/% change in the price
E d = -0.2
-0.2= % Change in quantity demanded/10%
- 2% =%change in quantity demanded
Therefore when the price has been increased by 10% then the quantity demanded has been decreased by 2%.
Answer 2: E s = 0.4
% change in price = 5%
E s = %Change in Quantity supplied/ %change in. Price
0.4*5%= % change in quantity supplied
2% =% change in quantity supplied
Therefore when price has been decreased by 5% then the quantity supplied has been decreased by 2% there is it correct relationship between quantity supplied and change in price.
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