7 answers
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c = acres of corn
w = acres of wheat
constraints:
c+w </= 100
graph that line,shade under
wheat cost = 20 w
corn cost = 40 c
20 w + 40 c </= 2400
graph that line, shade under
wheat labor = 4 w
corn labor = 16 c
4 w + 16 c </= 800
graph that line, shade under
Now the criterion
p = 80 w + 100 c
check p at every intersection of the above constraint lines, pick the biggest p