In 2019, X Company sold 6,400 units of its only product. Total revenue was $1,678,720, total variable costs were $643,200, and total fixed costs were $739,000. In 2020, there are only two expected changes: variable costs will increase by $3.10 per unit, and fixed costs will decrease by $23,900. How many units must X Company sell in 2020 in order to earn $35,000?