begin array c c text Quantity of singlets amp t... - JAMB Economics 1992 Question

(\begin{array}{c|c}

\text{Quantity of singlets} & \text{Short run total costs(N)} \

0 & 1,000 \

10 & 1,200 \

20 & 1,400 \

30 & 1,600 \

40 & 1,800 \

\end{array})

The short run total costs for different levels of output for a firm producing singlets are shown above. Calculate the variable cost per unit at an output of 20.