Big Cat Enterprises produces 1000 units of tiger feed per month. Each unit is sold for $4. Variable cost is $1.60 per unit and fixed costs are 51800 per month. Big Cat Enterprises is considering adding a vitamin supplement to improve the value of the product. The variable cost willing rease to $1.80 per unit and fixed costs will increase by 10%. The improved product will be sold for $8 each. How will this affect Big Cat Enterprises' operating income? Operating income will remain unchanged. Operating income will decrease by $2020 per month Operating income will decrease by $3620 per month Operating income will increase by $3620 per month