Answer:
To calculate the margin of safety in units, we first need to determine the break-even point in units. The break-even point is the point at which revenue equals costs. To find the break-even point in units, we can use the following formula:
Break-even point in units = Fixed costs / (Sales price - Variable costs)
Plugging in the given values, we get:
Break-even point in units = 150,000 / (2,100 - 1,600) = 150,000 / 500 = 300
So, the break-even point is 300 units.
The margin of safety is the difference between the expected sales and the break-even point. In this case, the expected sales are 420 units, so the margin of safety in units is:
Margin of safety in units = 420 - 300 = 120 units.