Cost of 7 gallons=$24.50
Cost of 1 gallon=24.50/7=3.5
Cost of 15 gallons=15*3.5=52.5
Cost of 15 gallons will be $52.5
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The wood before starting =12 feet
Left wood=6 feet
Wood used till now=12-6=6 feet
Picture frame built till now= 6/(3/4)
=8 pieces
Therefore, till now 8 pieces have been made.
tip=18% of 75.45
=18/100 * 75.45 = $13.581
Tip = $13.581
Cost before sale tax=$46.00
Cost after including tax=$48.76
Sale tax=$48.76-46.00
=$2.76
we know,
sale tax=((sales tax rate)/100) * cost before sale tax
2.76=((sales tax rate)/100) *46.00
sale tax rate=(2.76*100)/46
=276/46
=6%
There fore sales tax rate=6%
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