Final answer:
To find the break-even point in unit sales, you can divide the fixed expenses by the contribution margin per unit.
Step-by-step explanation:
The contribution margin is calculated by subtracting the variable expenses (VC) from the sales revenue. In this case, the contribution margin per unit is $28,000 / 1,000 units, which equals $28 per unit. The total fixed expenses (FE) are $21,840. The break-even point in units can be calculated by dividing the fixed expenses by the contribution margin per unit: $21,840 / $28 = 780 units.