income	tax	percent
------	---	-------
2300	0	11
3400	121	12
4400	251	15
6500	566	15
8500	866	17
10800	1257	19
12900	1656	21
15000	2097	24
18200	2865	28
23500	4349	32
28800	6045	36
34100	7953	40
41500	10913	45
55300	17123	50