Answer:
$478
Explanation:
To calculate the profit, we have to subtract the expenses from the revenues.
P = Revenues - expenses
We know the family gained $523 from the yard sale.
We also know they had to pay $45 for advertising.
So, the net different is the profit for the family:
P = $523 - $45 = $478.
That was a very good yard sale!, I hope mine went that well.