Answer:
The original price of a ticket to the play is $50. On Monday afternoons, the price is reduced to $35. Therefore, the discount for all tickets is:
$50 - $35 = $15
Students receive an additional $5 discount on all tickets. So the price of a student ticket on Monday afternoon is:
$35 - $5 = $30
Therefore, the discount for a student ticket is:
($50 - $30) / $50 × 100% = 40%
So the answer is C) 40%.