input: Write a python function to calculate the total cost of order items including tax.
  assert calculate_total([{"Name":"Apples","Price":2.00,"Qty":2},{"Name":"Milk","Price":2.50,"Qty":1},{"Name":"Eggs","Price":3.00,"Qty":6}], 0.08) == 23.40
  assert calculate_total([{"Name":"Bread","Price":1.50,"Qty":4},{"Name":"Butter","Price":0.99,"Qty":2}], 0.05) == 6.825
  assert calculate_total([{"Name":"Orange Juice","Price":3.75,"Qty":3},{"Name":"Cereal","Price":4.00,"Qty":2}], 0.10) == 20.90
output: def calculate_total(items, tax_rate):
      total = 0
      for item in items:
          total += item["Price"] * item["Qty"]
      total_with_tax = total * (1 + tax_rate)
      return round(total_with_tax, 2)