#1
``````**> def rental_car_cost(days):**
**>     cost = days*40**
**>     if days <= 7:**
**>         cost - 50 = cost**
**>         return cost**
**>     elif days <= 3:**
**>         cost - 20 = cost**
**>         return cost**``````

The error returns:
Oops, try again. It looks like rental_car_cost returns -10 instead of the correct amount (40) for 1 days.

I feel as though this is a common mistake so if you recognise it, please halp...

#2

Hi you should make that `cost - 50 = cost`
Like that `cost = cost - 50` same for the other.

#3

Sure thanks for the quick reply

#4

Exactly. The variable getting "filled" is on the left side of the equals sign. The right side of the equals sign is what the variable is filled by.

#5

Nope, sorry came up with "Oops, try again. Your code looks a bit off. Feel free to peek back at earlier exercises if you need a refresher! Your code threw the following error: can't assign to operator (python, line 7)"

#6

That's what you had before. You want, as @wizmarco said, `cost = cost - 50`. The same thing is true for this line, which also needs to be fixed: `cost - 20 = cost` should be `cost = cost - 20`.

#7
``````def rental_car_cost(days):
cost = days*40
if days <= 7:
cost = cost - 50
return cost
elif days <= 3:
cost = cost - 20
return cost``````

Like this?

#8

Try it and see what happens.

#9

`> Oops, try again. It looks like rental_car_cost returns -10 instead of the correct amount (40) for 1 days.`

#10

It's okay. You're getting closer. Two things to check:

1. Do you want to return a value no matter what?
2. Is the \$50 discount supposed to be for seven or less days, or for seven or more days?

#11

Here the Right indent

``````def rental_car_cost(days):
cost = days*40
if days <= 7:
cost = cost - 50
return cost
elif days <= 3:
cost = cost - 20
return cost``````

#12

Okay so it's if the days are greater than 7 there is meant to be a discount of \$50. I think everything is placed properly but it might be from the face that I didn't specify whether it's just simply over 3 days or between 3 and 7.

#13

Nope, still returns as error, but thanks

#14

In your `else if statement` make `days >= 3` also in the `if statement` `days >= 7`

#15

What does your function return if `days = 2`?

#16

`Oops, try again. It looks like rental_car_cost returns -10 instead of the correct amount (40) for 1 days.`

#17

Well that would mean if `days` is less than 7/3, and we want if it's greater than (<)

#18

No if `days greater than 7` so Its like that `days >= 7`
Its like that .
`Less than < greater than`

#19

oh nevermind I just solved it all I needed was a separate variable for the two discounts, but thanks for the effort