math
posted by debbie .
An advertisement states that eight thermometers cost $12.42 minus a 3% discount. Dr. wants to order a dozen to take advantage of the savings, sales tax is 5%. What would the cost be? Is my math right? I divided 8 by $12.42 and got $1.55 p/thermometer. 12*$1.55 would cost $18.60 for 12 minus 3% disc total cost would be $18.04. add 5% sales tax total cost $18.94

math 
Reiny
Since you probably used your calculator, why not carry all the digits and only round off your final answer.
that way, I got $18.97
here is my sequence ....
12.42
รท
8
x
12
=
x
.97
=
x
1.05 = 18.9746
so $18.97
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