Production and Costs I

Production and Costs I
In the short run,a manufacturer of small boats has the following production function,which shows the relationship between the number of workers employed and the number of boats built in a month.
Boats
Workers (number per month)
1 9
2 19
3 27
4 33
5 38
a.Based on this information,what is the marginal product,in boats,of the second worker?That is,how many additional boats are produced whenemployment is increased from one worker to two workers?____________________
b.returns first become apparent with the hiring of which worker?
A.The fifth worker
B.The first worker
C.The fourth worker
D.The third worker
E.The second worker