Answer:
The amount of cash received by the magazine company as advance payments from customers during the year 2013 must have been $14,400.
Explanation:
Let cash received from customers be x :
$12,700 + x - $14,800 = $12,300
x = $14,400
Therefore, The amount of cash received by the magazine company as advance payments from customers during the year 2013 must have been $14,400.