The easiest way to calculate full time pay is to just take the hourly wage and double it or x by 2. So if you make $48 per hour, 48+48=96 (one less mathematical calculation/step)
This comes in handy especially when you are racing somebody to solve annual salary OR if you want to look like you can do math super quick in you head.
geez.... my brain hurts..... that's to confusing...