Problem with 'Kaleidoscopes' code

Question

I think my formulas could be off (i am feeling brain fogged), but the required output value does not match the value outputted by my code (we are supposed to add a 10% discount to the total amount if someone has bought more than 1 kaleidoscope, and 7% tax on the total applies on either case):

quantity = int(input())

amount = quantity*5.00
tax = (7/100)*amount
discount = (10/100)*amount

if quantity > 1:
print(amount - discount + tax)
else:
print(amount + tax)

Please let me know what is wrong. Thank you.

Answer 1

Yousha ,

there are 2 issues to solve:

> all outputs has to be with 2 decimal places. (see task description)

> for all purchases with a quantity > 1, the tax calculation is not correct. calculate the tax *after* the discount is subtracted.

Answer 2

Yousha ,

may be it is easier to handle the calculation of tax and discount by using a factor instead of formulas.
pre-calculate these factors and then use them.

> the reduction of the discount has a factor of 0.9 = ((-10 + 100) / 100)

> the calculation of the tax has a factor of 1.07 = ((+7 + 100) /100)

if quantity is > 1: amount * factor_discount * factor_tax => and output it to 2 decimal places
if quantity is 1 : amount * factor_tax => and output it to 2 decimal places

Answer 3

Lothar ,

It seems statistics is not my strong suit. I'll work on that. Thank you for the help.

Answer 4

Lothar ,

Thank you. It is working now