otal cost of reducing emissions by $20$ tons$/$month $$50$

Total cost of reducing emissions by $40$ tons$/$month $$150$

Total cost of reducing emissions by $60$ tons$/$month $$270$

Total cost of reducing emissions by $80$ tons$/$month $$410$

Total cost of reducing emissions by $100$ tons$/$month $$570$

Factory $2$

Current emissions $($tons$/$month$)160$

Total cost of reducing emissions by $20$ tons$/$month $$20$

Total cost of reducing emissions by $40$ tons$/$month $$60$

Total cost of reducing emissions by $60$ tons$/$month $$110$

Total cost of reducing emissions by $80$ tons$/$month $$200$

Total cost of reducing emissions by $100$ tons$/$month $$300$

$2$nd attempt

$1$st attempt