input: Write a python function to calculate profit given the number of chairs, desks, and couches, and their respective prices.
  assert calculate_profit(25, 50, 75) == 8750
  assert calculate_profit(10, 20, 30) == 3750
  assert calculate_profit(5, 10, 15) == 1875
output: def calculate_profit(chairs, desks, couches):
      price_chair = 50
      price_desk = 100
      price_couch = 150
      return (chairs * price_chair) + (desks * price_desk) + (couches * price_couch)