Question 1054281
Let X be the jars of sauce, Y be the jars of salsa,
Look at how many tomatoes are used,
{{{10X+5Y<=140}}}
Look at how many onions are used,
{{{X+Y/4<=13}}}
Finally identify the profit,
{{{P=2X+1.5Y}}}
Graphing the feasible region,
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 *[illustration de4.JPG].
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Check the profit at each of the vertices,
(0,28):{{{P=2(0)+1.5(28)=42}}}
(12,4):{{{P=2(12)+1.5(4)=30}}}
(13,0):{{{P=2(13)+1.5(0)=26}}}
The most profit is made by only making salsa. 
28 jars getting you $42.
However the farm stand owner wants 3X jars of sauce versus salsa so (12,4) would yield $30 profit. 
You may want to convince her that she's losing $12 profit and change her view.