Step-by-step explanation:
Prices:
[tex]C_{pen}=1.25[/tex]
[tex]C_{pencil}=0.25[/tex]
Goal:
[tex]n_{pen}=50[/tex]
[tex]n_{pencil}=100[/tex]
[tex]E=115[/tex]
Earnings for 50 pens and 100 pencils
[tex]E=50*1.25+100*0.25=87.5[/tex]
As can be seen, they have to either rise the number of pens and pencils they would like to sell, or they will have to lower they goal of learning