marginal product of labour

[MONIKA]

Suppose the marginal product of labor for unskilled labor is given by MPN = 200 – 0.5N. The supply of unskilled labor is given by 100 + 4w. The government imposes a minimum wage of 40. How much unemployment will this create among unskilled labor?
1)      100
2)      80
3)      0
4)      60

[AJ]

3) 0

[Manvendra]

 Equilibrium Level of Wage Rate = 50
 Minimum Wage Rate  = 40

As the Equilibrium Wage Rate > Min. Wage Rate..this would not effect the demand for labor and the labor mkt will remain in   equilibrium where MPL function equates Supply fn.

[kratika]

@manvendra- can u plz explain how u got the equilibrium wage rate?

[lovekesh]

I don't know i should be answering your question since it's  directed to a specific person, But i will proceed.
MPN curve given is the demand function of labor by firm or whatever. MPN is basically the real wage. The supply curve of labor is somethn like
N= 100+4w
w= (N-100)/4
and you equate it with MPN.

[kratika]

@lovekesh- thanks :)