dùng hàm if else nha mn, giúp mình xíu mình cần

#include<bits/stdc++.h>
#define ll long long
using namespace std;

int main(){
    ll n;
    cin>>n;
    double s=0;
    //meothinhle
    if (n>0 && n<6) s=n*6500;
    else if (n>5 && n<11) s=5*6500+(n-5)*7800;
    else if (n>10 && n<26) s=5*6500+5*7800+(n-10)*9200;
    else s=5*6500+5*7800+15*9200+(n-25)*10300;
    cout<<fixed<<setprecision(2)<<s;
    cout<<fixed<<setprecision(2)<<s*0.12;
    cout<<fixed<<setprecision(2)<<s+s*0.12;
    return 0;
}

/**
 *    author:  cody
 *    created: 10.08.2024 05:10
 **/

#include <bits/stdc++.h>

using namespace std;
#define ll long long

ll n, s = 0;
int main()
{
    // freopen(".inp" , "r" , stdin);
    // freopen(".out" , "w" , stdout);
    cin >> n;
    if (n <= 5)
    {
        s += n * 6500;
    }
    else if (n <= 15)
    {
        s += (5 * 6500) + (n - 5) * 7800;
    }
    else if (n <= 25)
    {
        s += (5 * 6500) + (10) * 7800 + (n - 15) * 9200;
    }
    else if (n >= 26)
    {
        s += (5 * 6500) + (10) * 7800 + (10) * 9200 + (n - 25) * 10300;
    }
    cout << setprecision(2) << fixed << (float)s << '\n';
    cout << setprecision(2) << fixed << (float)s * 12 / 100 << '\n';
    cout << setprecision(2) << fixed << (float)s + (s * 12 / 100);
    return 0;
}