Answer:
Is there a typo in this page of work? It should be $225 more... But this isn't an option... I'm not sure... Is it possible to contact a teacher?
Explanation:
7/10 of $450 is $315
Online price: $315
6/5 of $450 is $540
Other department store: $540
$540-$315=$225
This doesn't make sense at all... sorry...