HURRY 25 POINTS IF RIGHT

Kevin is choosing between two cell phone plans. Plan A has a flat monthly charge of $32 for an unlimited number of minutes. Plan B has a monthly charge of $24 plus an additional charge of $0.05 per minute. For what number of minutes in one month of usage do both plans cost the same amount?
A) 160 minutes
B) 480 minutes
C) 640 minutes
D) 1600 minutes