John is a math tutor. For each tutoring session, he charges each student a base fee of $40 plus an additional fee that depends on how many students
are in the session. He will accept up to 5 students per session, and his
additional fee per student varies inversely with the number of students in the
session. If a session with two students costs $70 per student, how much
does a session with 4 students cost per student?
$35
B
$55
С
$120
D
$140
E
$160