Aluminum Joinery

package main

import "fmt"

func main() {
    var count int
    fmt.Scanln(&count)

    var size, delivery string
    fmt.Scanln(&size)
    fmt.Scanln(&delivery)

    var price = 0
    var discountPercentage = 0.0

    if count <= 10 {
         fmt.Println("Invalid order")
    } else {
        switch size {
        case  "90X130":
            price = 110
            if count > 60 {
                discountPercentage = 8
            } else if count > 30 {
                discountPercentage = 5
            }
        case  "100X150":
            price = 140
            if count > 80 {
                discountPercentage = 10
            } else if count > 40 {
                discountPercentage = 6
            }
        case "130X180":
            price = 190
            if count > 50 {
                discountPercentage = 12
            } else if count > 20 {
                discountPercentage = 7
            }
        case "200X300":
            price = 250
            if count > 50 {
                discountPercentage = 14
            } else if count > 25 {
                discountPercentage = 9
            }
        }

        var totalPrice = float64(price * count) * (100 - discountPercentage) / 100

        if delivery == "With" {
            totalPrice += 60
        }

        if count > 99 {
            totalPrice *= 0.96
        }

    fmt.Printf("%.2f BGN\n", totalPrice)
    }
}