Answer:
Jayanta needs 2 labor union groups and 8 church groups.
Step-by-step explanation:
Let c denotes churches
.
Let l denotes labor unions.
We know that Jayanta can only spend 20 hours letter writing and 14 hour of follow-up.
So, equations becomes:


And total money raised can be shown by = 
We have to maximize
keeping in mind that
and
We will solve the two equations:
and 
We get l = 2 and c = 8
And total money raised is
=
dollars.
Hence, Jayanta needs 2 labor union groups and 8 church groups.