One last time, consider Problem $1.$ Assuming that the optimal solution $($x$1*,$x$2*)$ stays the same as Problem $1,$ recalculate the objective value $($without redoing the Graphical method$)$ when: a$)$ The objective function changes to: Max $90$x$1+90$x$2$ b$)$ The objective function changes to: Max $150$x$1+60$x$2$