a. How long, on average, does it take to complete the entire process for a group portrait? ____ minutes. (Enter your response as an integer.)

Melissa's Photo Studio offers both individual and group portrait options. The process flow diagram below shows that all customers must first register and then pay at one of two cashiers. Then depending on if they want a single or group portrait they go to different rooms. Finally everyone picks up their own finished portrait. Cahier A (6 min) Individual portrait taken (20 min) Registration (6 min) Pick up portrait (10 min) Cahier B (8 min) Group portrait taken (30 min)