Two taxes combination
Total payed last year = $ 3,557.25
THEN if
For $10000. Then $765 is deduced
For $ 50000. 5x 765 is deduced = 3825, it surpases tax
For $40000. 4x 765 = 3060 is deduced
Then its between $40000 and $50000
Calculate now 3557.25 - 3060 =$ 497.25
THEN $497.25 Is equivalent to 65% of taxes. Then this amount taxed was $6500
In consecuence , Jon's income last year was
$40000+ $6500 = $46500 dollars