Answer:
6 dollars
Explanation:
you multiply 3 by 8 which is 24. Then you multiply 4 by 15 and that's 70. So then you add 24 and 70 together which is 94. Lastly you subtract 94 from 100 and you get 6.
He received $16 change
3 books for $18 is $24
4 DVDs for $15 is $60
His total is $84
$100 - $84 = $16
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