Answer:
$4 - $5 = -$1
Explanation:
In the month of July,
The milk and cookies' profit as shown on the bar is $2
In the month of August,
The milk and cookies's profit is also $2 as shown on the bar chart
For the month of September:
The milk and cookies' value all read negative, meaning there was no profit in the month of September.
$5 was lost
Implication is, sales were low or some other market factors affected.
For JULY and AUGUST,
The profit is $2 + $2 = $4
For SEPTEMBER,
The lost is $5
Therefore -$5 loss + &4 profits = -$1 loss.