input: Write a python function to calculate total sales given lists of item prices and quantities.
  assert calculate_total_sales([1.99, 3.00, 2.50], [5, 10, 8]) == 54.9
  assert calculate_total_sales([2.50, 4.00], [2, 3]) == 17.0
  assert calculate_total_sales([5.00], [1]) == 5.0
output: def calculate_total_sales(prices, quantities):
      return sum(price * quantity for price, quantity in zip(prices, quantities))