Answer:
b. 4
Explanation:
The computation of the real wage rate is as follows:
Number of workers Number of cases produced Marginal product
0 0 -
1 10 10
2 19 9
3 26 7
4 31 5
5 34 3
At optimal MP = real wage rate.
So,
For 4th worker , MP is 5
And for 5th worker ,MP is 3
So in the case when we hire 4 workers so the real wage rate should lies in between of 3 and 4
Therefore the real wage rate is 4