Answer: a: wage is $12 and quantity of labour is 6
Explanation:
the question is unclear with regards to whether it is a multiple choice or we have to discuss all three point (from A to C). I will assume the question its a multiple choice
labour demanded Ld = 30 - 2W and labour supplied Ls = 0.5W
Equilibrium Point is where demand and supply meet at that point demand is equal to supply, therefore to find equilibrium wage we need to equate labour supply curve and labour demand curve
0.5W = 30 - 2W
0.5W + 2W = 30
2.5W = 30
W = 30/2.50 = 12
substitute W = 12 in the labour supply and labour demand equations
ld = 30 - 2(12) ls = 0.5(12)
ld = 6 ls = 6
when the wage price is $12 the quantity of labour supplied and demanded is 6 . Labour Market is at Equilibrium when wage is $ 12 dollar and quantity of labour supplied and demanded equals to 6.