failed kotline lesson 17

Question

I failed in cases 5, 6 and 3 and I can't see where I was wrong because I don't have sololearn pro
Does anyone know what I was wrong about or how to fix it?
here I leave the code:
fun main() {
var hours = readLine()!!.toDouble()
var total = 0.0
if(hours >= 24){
total += 15
hours -= 24
if (hours > 0){
total += hours * 0.5
}
}else if (hours >= 5){
total += 5
hours -= 5
if (hours > 0){
total += hours * 0.5
}
}else if (hours < 5){
while (hours > 0 ){
total += 1
hours -= 1
}
}
println(total)
}

Answer 1

The problem might be with:
if(hours >= 24)
The task says "each 24 hours is a flat rate of $15". If you have 48 hours = $30, 75 hours = $46.50 and so on.

Answer 2

Thanks