First 1700 is paid with a comission of 4.71%, over 1700 11%, in this case she sells:
[tex]3265.49-1700=1565.49[/tex]1565.49 over 1700, that means at 11% of comission.
Her comission must be:
[tex]1700\cdot0.0471+1565.49\cdot0.11[/tex][tex]80.07+172.2039[/tex][tex]252.2739[/tex]