Answer: Hello mate!
The price wihtout tax is:
$12 + $26 + $125 = $163
Now, the tax rate was 5.6%, this means that there is a 5.6% of the $163 wich is added as tax:
When you want to calculate the percent of a number, you need to multiply the number by the decimal form of such percent (wich is calculated as the percent divided by 100%)
in this case we have:
(5.6%/100%) = 0.056
and then:
0.056*$163 = $9.128
So the total price is P = $163 + $9.128 = $172.128