Please help with the last question- The total cost of crashing the project to 7 weeks:

waperimental model and related data are lated in the fobowing table The frut acsuity to crash is D "by 2 weous at a per week erathing oost of 80 deklors Naxt one thoud erath acthily D and activity by 2 Weabs fier an asticonwi loter per week erasting pont of 180 doller Riet actriny to crabt in oroer a by 2 weoks at a per week oreving sert ot aso dofarn Totar cost ef craking the projed to 7 wesks =