And two sisters, julia and anna, both trade stocks online to supplement their pensions. in 2015 julia earned $20,000 more than anna from her trading. for 2015 neither of them reported their investment income to the canada revenue agency. in 2016 julia made $30,000 more from trading than she had the year before, and anna made $10,000 more than she had the year before. for 2016 both declared their trading income and paid 50% of it in tax. their combined income after tax from trading in 2016 was $80,000. how much did julia make from trading in 2015?