Decimal Rounding error

[project_science]

Thanks for your help. I fixed the issue by rounding s_discount in a separate function, and used a similar method in the additional discount function. I was finally able to separate the raw data from the display data.

"""**********
Functions
"""
#func 1: student discount which discounts the current price to 10%.
def student_discount(price):
    s_discount = price * .9  # represents 10% discount
    return s_discount #returns raw price


# used for display only, receives raw student discount
def student_rounding_display(display_price):
    display_price = round(display_price, 2) #round to 2 decimals
    display_price = "${fprice}".format(fprice=display_price)  # takes data type in format and auto-coverts the return as a string, joins with manual inserted $
    return display_price


#func 2: additional discount for regular buyers which discounts an additional 5% on the current student discounted price
# receives raw student discount, and prints display price
def additional_discount(s_discount):
    total_discount = s_discount * .95 #represents a 5% discount on the already reduced 10% discount
    display_price = total_discount
    display_price = round(display_price,2) #round to 2 decimals
    display_price = "${fprice}".format(fprice=display_price)  # takes data type in format and auto-coverts the return as a string
    print(">> Total discount = ", display_price)
    #return total_discount   <--uncomment only if you'd need to use and return the non-rounded varaible, which you don't in this problem

"""**********
Main code
"""

#enter retail value of a product
price = float(input("Enter price: "))

#pass raw price into func 1 for 10% reduction
s_discount = student_discount(price)
print(">> Student discount price = ", student_rounding_display(s_discount))

#ask user if further 5% should be included
user_input = input("\nInclude another 5% discount? Press 'y' or 'n': ")

if user_input == 'y':
    # pass the 10% price reduction outcome into func 2 for further 5% reduction
    additional_discount(s_discount)
else:
    print(">> No further discounts, final price was student-only discount: ", student_rounding_display(s_discount))