Answer:
best case scenario:
project outlay = $874,800
yearly cash flows:
yearly cash flows = {[(93,500 x $60.50) - (93,500 x $35.10) - $688,500 - $97,200] x (1 - 24%)} + $97,200 = $1,304,992
using a financial calculator, NPV = $6,351,002.73
worst case scenario:
project outlay = $874,800
yearly cash flows:
yearly cash flows = {[(76,500 x $49.50) - (76,500 x $42.90) - $841,500 - $97,200] x (1 - 24%)} + $97,200 = -$232,488
using a financial calculator, NPV = -$2,071,211.79