Answer is in the file below
tinyurl.com/wpazsebu
Price per box, P = $1.45 .
Money left, M = $1247 - $472.70 = $774.3 .
Let, number of boxes are x.
So,

Therefore, they have to sell 534 more boxes.
Hence, this is the required solution.
Answer:
[xl-8
Step-by-step explanation: