Fruit Sushi Corporation sells delicious fruit sushi at a wholesale price of $4.50 per unit. The variable cost to manufacture is $1.75 per unit. The monthly fixed costs are $8500. Its current sales are 29,000 units per month. If the company wants to increase its operating income by 20%, how many additional units must it sell? (Round any intermediate calculations to two decimal places and your final answer up to the nearest whole unit.)