Kaleidoscopes

Question

Where is my mistake? The solution I'm getting, when I get a input of 3 is wrong by 0.1 evertime:

You sell souvenir kaleidoscopes at a gift shop, and if a customer buys more than one, they get a 10% discount on all of them!
Given the total number of kaleidoscopes that a customer buys, let them know what their total will be. Tax is 7%. All of your kaleidoscopes cost the same amount, 5.00.

Task:
Take the number of kaleidoscopes that a customer buys and output their total cost including tax and any discounts.

Input Format:
An integer value that represents the number of kaleidoscopes that a customer orders.

Output Format:
A number that represents the total purchase price to two decimal places.

Sample Input:
4

Sample Output:
19.26

my solution:

num = int(input())

disc = 0.1
tax = 0.07
cost = 5
total = 0

if num > 1:
total = num*cost+(num*cost*tax)-(disc*num*cost)
else:
total = num*cost+(num*cost*tax)

print(round(total,2))

Answer 1

#This way, is it not working..?

num = int(input())

disc = 0.1
tax = 0.07
cost = 5
total = num * cost

if num > 1:
total += (total*tax)
total -= disc*total
else:
total += (total*tax)

print(round(total, 2))

Answer 2

Discount should be applied on net total.
ie total -= (total +tax)*disc
you are applying only on cost
hope it helps...

Answer 3

But when I apply the discount on tax+cost, the result is also wrong.

Answer 4

It is working! I will need a few minutes to understand 😅

Answer 5

Ok, finally I've found the mistake in my way of thinking! Thank you a lot, Jayakrishna!

Answer 6

Arin can you explain what you mean?
I said about only discount, not tax i think. And discount will deducted and tax will be added to total.

Answer 7

Arin
You can apply discount on total price combined with tax.
( total += total*0.07 ) =>then deduct discount

Or
You can apply tax on total price combined with discount as you are doing. (price-discount) * 0.07
Deduct discount total-=total*0.1 => then add tax to total.
( not you just applied on price)

either way, you apply on net total price, not just on price.

But OP did price*0.07 ( price is num*5). and discount is price*0.1) both original prices, but not on grant total price.
so that's the mistake what i told.
Hope it clears my intention there to you...

Answer 8

Jayakrishna 🇮🇳sorry for replying in this discussion thread 1 year later but
discount applied on net total or tax applied on net total is the same as per my calculations

Answer 9

# Jayakrishna 🇮🇳
qty = int(input())
price = qty*5.00
discount = price*0.1
tax = (price-discount)*0.07
if qty>1:
total = price + tax - discount
elif qty==1:
discount = 0
total = price*1.07
print(round(total,2))
#here as you can see I have put discount over price and i have applied tax overall total price combined with discount