Let
R--------------------> money earned washing cars by the three friends
1)R>$200--------------> initial inequality
2) they paid their parents $28
R-28>($200-$28)
R1=R-28
R1>($200-$28)------------> R1>$172
R1---------> money earned minus $28
3) divided the rest of money equally
(R-28)/3>$172/3
R3=(R-28)/3-----------> amount each friend earned
R3>$172/3--------------> R3>$57.33 (final inequality)
the answer is
R3>$57.33