# function to calculate electricity bill based on unit consumption def eb(unit):     # first 100 units are free     if unit <= 100:         cost = 0.00     # for 101–200 units, charge ₹2.50 per unit above 100     elif unit <= 200:         cost = (unit - 100) * 2.50     # for 201–300 units, add ₹3.00 per unit above 200     elif unit <= 300:         cost = 100 * 2.5 + (unit - 200) * 3.00     # for 301–400 units, add ₹4.50 per unit above 300     elif unit <= 400:         cost = 100 * 2.5 + 100 * 3 + (unit - 300) * 4.50     # for units above 400, add ₹6.00 per unit above 400     else:         cost = 100 * 2.5 + 100 * 3 + 100 * 4.5 + (unit - 400) * 6.00     # return the total calculated cost     return cost  # input the total units consumed unit = int(input("enter the unit: "))  # call the `eb` function to calculate the electricity bill eb_bill = eb(unit)  # display the calculated electricity bill amount print("electricity bill amount:", eb_bill) 

Enter the unit:345 Electricity bill amount: 752.5