Answer:
$1.43
Step-by-step explanation:
A lot of information is missing, but i found a similar question. Hope it can help.
Labor Q Fixed Variable Total Marginal Average
costs costs cost cost total cost
0 0 50 0 50 0 0
1 10 50 30 80 8 8
2 24 50 60 110 2.5 4.58
3 49 50 90 140 1.20 2.86
4 70 50 120 170 1.43 2.43
5 82 50 150 200 2.50 2.44
marginal cost is calculated by dividing the incremental cost ($30) by the incremental output (21) = $30 / 21 = $1.4286 ≈ $1.43