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let A, S be cost price for art book, story Book
A(1+15/100)=345
A=345/1.15=300
S(1+10/100)=110
S=110/1.1=100
total cost =400
total sale = 345+110=455
sale tax = (455-400)*100/400=13.75%
A(1+15/100)=345
A=345/1.15=300
S(1+10/100)=110
S=110/1.1=100
total cost =400
total sale = 345+110=455
sale tax = (455-400)*100/400=13.75%
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