class Saldo {
    public static void main(String[] args) {
        String metodePembayaran = "BI-FAST";
        double saldo = 100_000;
        double nominalTransfer = 200_000;

        //Potong biaya admin dulu
        switch(metodePembayaran) {
            case "BI-FAST":
                saldo -= 0; //Promo BI-FAST gratis
                break;
            case "RTOL":
                saldo -= 6500; //Transfer online biasa
                break;
        }

        //proses transfernya
        if (saldo <nominalTransfer) {
            System.out.println("Trx gagal: saldo tidak cukup!"):
    } else
            saldo -= nominalTransfer;
        System.out.println("Trx berhasil! sisa saldo: " + saldo);
    }
}