In the following AON project network, the estimated normal durations for each task are indicated at each node. Each task in this project can be compressed by a maximum of two weeks; each week$$s decrease will cost an amount that is equal to its estimated normal duration $($for example, the duration of task A can be reduced to six weeks by spending an additional $$7$K$,$ or it can be reduced to five weeks for an additional cost of $$14$K$)$