Answer:
c. 800 units.
Explanation:
The total cost can be calculated as follows;
Total Cost = Fixed Cost + Variable Cost ----------------<em>Equation 1
</em>
If x is the number of units produced then;
<em>Total Cost = $3.00 x</em>
<em>Variable Cost = $2.50 x
</em>
<em>Fixed Cost = $400
</em>
By applying the above given costs in the equation 1 to find the number of units produced;
$3.00 <em>x</em> = $400 + $2.50 <em>x</em>
Subtract the above Equation by $2.50 <em>x</em>, we get;
$3.00 <em>x</em> - $2.50 <em>x</em> = $400
$0.50 <em>x</em> = $400
Dividing the above equation by $0.50, we get;
<em>x</em> = 
<em>x = 800 units</em>.
Hence, option '<em>c'</em> will be correct answer.