Please answer d$!$

Kalyan Singhal Corp. makes three products, and it has three machines available as resources as given in the following LP

problem:

a$)$ Using a computer software for solving LP$,$ the optimal solution achieved is:

$x_1=6\mathrm{.}26($round your response to two decimal places$).$

$x_2=5\mathrm{.}12($round your response to two decimal places$).$

$x_3=9\mathrm{.}48($round your response to two decimal places$).$

Contribution $($objective value$)=,($round your response to two decimal places$).$

b$)$ Machine $1$ has hours of unused time available at the optimal solution $($round your response to two decimal places$).$

Machine $2$ has hours of unused time available at the optimal solution $($round your response to two decimal places$).$

Machine $3$ has hours of unused time available at the optimal solution $($round your response to two decimal places$).$

c$)$ An additional hour of time available for third machine, is worth $0\mathrm{.}27$ dollars to the firm $($round your response to two decimal places$).$

d$)$ An additional $5$ hours of time available for the second machine, at no cost to the firm, are going to increase the objective value by