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# Swift Enums and Struc Help Challenge 4 or 4

This is how far i have gotten. X-Code playground shows Double -> Double but the treehouse says its not returning a expected Double? I'm lost!!!

struct.swift
```struct Expense {
var description: String
var amount: Double = 0.0

init (description: String) {
self.description = description
}

func calculateTaxes(percentage: Double) -> Double {
return (self.amount * (percentage/100))
}

}

var item = Expense.init(description: "I hope this works")
item.amount = 100
var taxes = Expense.calculateTaxes(item)
```

Hello:

You are doing great, but the challenge is asking to call the method calculate taxes, to figure out how much in taxes item will be.

Since calculate taxes has a parameter of type double, and the challenge ask you to calculate 7.5 on item, then you would call it like this.

```item.calculateTaxes(7.5)
```

Then the method will calculate taxes on the 100.

Your code should look like this

```struct Expense {
var description: String
var amount: Double = 0.0

init (description: String) {
self.description = description
}

func calculateTaxes(percentage: Double) -> Double {
return (self.amount * (percentage/100))
}

}

var item = Expense(description:"Car")
item.amount = 100
var taxes = item.calculateTaxes(7.5)
```

Good luck, hope this helps

Ah. I see what you mean. I tried every combination but that one... Go Figure! Thank you for the help and explanation!

I solved mine this way and I completed the challenge.

```struct Expense {
var description: String
var amount: Double = 0.00

init (description: String) {
self.description = description

}
func calculateTaxes(percentage: Double) -> Double {
return (self.amount * (percentage/100))

}

}

var item = Expense.init(description: "Ticket")
item.amount = 100
var taxes = item.calculateTaxes(7.5)
```