$[$QX$]$: $7-33$ The computer output given below is for Problem $7-31.$ Use this to answer the following questions.

a$.$ How much could the profit on $x$ increase or decrease without changing the values of $x$ and $Y$ in the optimal solution?

b$.$ If the right$-$hand side of constraint $1$ were increased by $1$ unit, how much would the profit increase?

c$.$ If the right$-$hand side of constraint $1$ were increased by $10$ units, how much would the profit increase?