Answer:
$500
Step-by-step explanation:
At $3.50 per copy from Marc
500 copies would cost
500 × $3.50
= $1,750
At $4.50 per copy from the publisher
500 copies will cost
500 × $4.50
=$2,250
Diane's damages= difference in the cost of books from Marc and the publisher.
$2,250 - $1,750
=$500