Hours 4.75 x$81.00base rate = $384.75 11% of $384.75 $42.32

5% of $384.75 $ 19.24

-10% of $384.75 -$38.48

15% of $384.75 $57.71 + $4.00 Total = $469.54

So my question is that i need help coming up with a formula so i can plug in the total with a number and it come out with the base rate amount

to explain this problem this is 4.75 hr multiplied by 81$ which gives you 384.75 then individually you take the % from that base total of 384.75 add all them together and the 4$ fee and you get 496.54 but i want to make a formula so that i just plug in my total number of 496.54 and it says the base hourly rate is 81$. Someone please help me.