Hey there!
$18/2 = $9
So, bookset #1. [$9.00] per book
$45/6 = $7.50
So, bookset #2. [$7.50] per book
Based on that information we have provided. It’s better to pay:
[$45 for 6 books instead of paying $18 for 2 books]
$45 for 6 books would be more reasonable price for the books whereas $18 for 2 isn’t.
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)