How do I combine the values in add_activity instead of replacing them

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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How do I combine the values in add_activity instead of replacing them
 
class LeisureTracker:
    def __init__(self):
        self.activities = {}

    def add_activity(self, task, cost):
      self.task = task
      self.cost = cost
      self.activities[task] = cost

    def print_summary(self):
      print(self.activities)

     
tracker = LeisureTracker()

tracker.add_activity('Cinema', 23.50)
tracker.add_activity('Mini golf', 125.98)
tracker.add_activity('Concert', 57.85)
tracker.add_activity('Concert', 33.00)
tracker.add_activity('Cinema', 25.00)

tracker.print_summary()
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