168
So you take the 144 divide 12(the dozen) so we could find how much 1 cost, it was 12. You added 2 more books so we add(12x2)+(144). That equals to 168
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Step-by-step explanation:
Hello there!
Calulate the area of each side:
(Top and bottom)
18x11x2=396
3x11x2=66
3x18x2=108
All together=570 in ^2