80f + 150c ≤ 800 kilos kilos total of of cost fish chicken (pesos) 0 5 750 2 4 760 4 3 770 6 2 780 8 1 790 10 0 800 Edwin
Use inequality 80*F + 150*C <= 800 and keep in mind that the amounts of fish (F) and chicken (C) are not necessary integer numbers of kilograms. They can be fractions, rational or decimal, too. At least, the condition does not prohibit it; and real life admits it, too.