Answer:
$3.5
Step-by-step explanation:
Let $x be the notebook's cost.
You buy 3 notebooks for $x each, then these notebooks cost $3x. You also buy a backpack for $24.00. Hence, the total cost of your buying is
$(3x+24).
You pay 6% in sales tax on your purchase, then you pay
$(3x+24)+$(3x+24)·0.06=$1.06(3x+24)
Your bill is $36.57, so
[tex]1.06(3x+24)=36.57\\ \\106(3x+24)=3,657\ [\text{Multiplied by 100}]\\ \\318x+2,544=3,657\\ \\318x=3,657-2,544\\ \\318x=1,113\\ \\x=3.5[/tex]
Hence, each notebook costs $3.5
