Answer
The month of April had the greatest profit while the month of January had the greatest loss.
Work Step by Step
From Exercise 52, the profit or loss (a negative value means a loss) for each month is:
\begin{array}{ccccccccc}
&\text{January:} &-\$700
\\&\text{February:} &-\$100
\\&\text{March:} &\$700
\\&\text{April:} &\$900
\\&\text{May:} &\$0
\\&\text{June:} &\$700
\end{array}
Thus, the month of April had the greatest profit while the month of January had the greatest loss.
