The breakeven point is 2000.
Breakeven point are the number of units sold at which net income is zero. It is a function of fixed cost, price and average variable cost.
Breakeven point = fixed cost / (price - average variable cost )
Fixed cost is cost that does not change regardless the level of output.
Average variable cost is total variable cost divided by output.
Price is the going price of an item.
Breakeven point = $120,000 / ($100 - $40)
$120,000 / $60 = 2000
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