$2$pts a$.$ For the following PERT problem, identify the normal solution $($path$,$ time, and cost$)./5$pts b$.$ In the space below, identify the ES$/$EF$/$LS$/$LF for each activity $($using normal times$)./$ipt$..$c Identify the change ni cost over the change ni days for each activity.$/$pt$.$ d$.$ Identify the all$-$crash solution$4$cstyadays:Activity normal time normal cost crash time crash costA $80$days$ $50050$ days$$10001000-500/80-50=76=03\mathrm{.}61/05$B $20$$$40010$$$22002200-400/2010551800/10=18030$$$2001100-200/30-20=900/0=1020$$$110080$ $$100601000-100/80-60=900/20245$$$10003000-800/60-30=2200/80-733360$ $$80030$$$30008002000-800/80-50=1400/30=46\mathrm{.}67$GF$40$ $$60050$$$200003$$$1000$