Answer: $30,976
Explanation: we can conclude that as follows :-
labor cost = (no. of units) * (hours for each unit) * (per unit cost)
Therefore, In march :-
labor cost = (2,040 units) * (0.8 hrs) * ( $8.80)
= $14,361.6
In april :-
labor cost = (1820 units) * (0.8 hrs) * ( $8.80)
= $12,812
Now,
minimum cost = (1760 hrs) * ($8.8) = $15,488
Hence company has to pay minimum cost as per agreement, therefore :_
combined cost = $15,488 + $15,488 = $30,976