I believe 10% because 390 and 39 are exactly the same numbers almost
The amount is about 47.91. The steps I used is I first divided his income of $49,830 by the number of weeks in a year, 52, to get his weekly income, which is roughly $958.27. I then divided that by 20 to get 5% of it for the tax, to get $47.91. Hope this helps! :P
If it is .18x then x equals 22,222.2222222222
If just 18 then x equals 222.222222
5/9 you just have to multiply 2/3 by 5/6