# Write a split_check function that returns the amount that each diner must pay to cover the cost of the meal.

#The function has four parameters:

# bill: The amount of the bill.
# people: The number of diners to split the bill between.
# tax_percentage: The extra tax percentage to add to the bill.
# tip_percentage: The extra tip percentage to add to the bill.
# The tax or tip percentages are optional and may not be given when calling split_check. 
# Use default parameter values of 0.15 (15%) for tip_percentage, and 0.09 (9%) for tax_percentage. 
# Assume that the tip is calculated from the amount of the bill before tax.


def split_check(bill, people, tax_percentage=0.09, tip_percentage=0.15): 

    # tip is based on bill BEFORE tax
    tip_amount = bill * tip_percentage

    #Tax is based on bill 
    tax_amount = bill * tax_percentage 

    total = bill + tip_amount + tax_amount
    return total / people 

    bill = float(input())
    people = int(input())

#Cost per diner at the default tax and tip percentages 
print (f'Cost per diner: ${split_check(bill, people):.2f}')

bill = float(input())
people = int(int(input())
new_tax_percentage = float(input())


#Cost per diner at different tax and tip percentages 
print(f'cost per diner: ${split_check(bill, people, new_tax_percentage, new_tip_percentage):.2f}')