Answer:
If the company decides to process it further, it will increase operating income $68,000
Explanation:
Selling the chemical on processing, 
the Sales will be = Gallons of chemical produce × Selling price per gallon
                             = 150,000 × $5
                             = $750,000
Cost of Processing the chemical = $530,000
Operating Income on selling the chemical: 
= Sales -  Cost of Processing the chemical
= $750,000 - $530,000 
= $220,000
Total cost incurred to process the chemical into a weed killer: 
=  Cost of Processing the chemical + 
= $532000 + $260,000 
= $792,000
Sales of 150,000 gallons of weed killer: 
= Selling price per gallon × Chemical produce
= $7.20 × 150,000 gallons 
= $1,080,000
Operating income on processing to weed killer: 
= Sales of 150,000 gallons of weed killer - Total cost incurred to process the chemical into a weed killer
= $1,080,000  - $792,000
= $288,000
So, If the company decides to process it further, it will increase operating income by: 
= Operating income on processing to weed killer - Operating Income on selling the chemical
= $288,000 - $220,000
= $68,000