<Kotlin function not returning value> This functio...

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Kotlin function not returning value
This function is supposed to take a Double, 'amount', and a Boolean, 'international' and return the shipping cost for an order based on the on the location of the order and the amount.
Code:
fun shippingCost(amount: Double, international: Boolean): Double {
val shipping = when {
amount >= 75 -> 0.0
amount < 75 -> amount * 0.1
international == true -> amount * 0.15
else -> 50.0
}
return (shipping)
}
fun main(args: Array) {
val total =...