Table $1$ below provide the information on cost$-$duration trade$-$off for Project

Solaria. The indirect costs for each project duration are RM$90(15$ time units$),$ RM$70(14$ time units$),$ RM$50(13$ time units$),$ RM$40(12$ time units, and RM$30(11$ time units$).$ Report the total direct, indirect, and project costs for each duration. Identify the optimum cost$-$time schedule for the project and the associated cost.