Can anyone tell me why m not passing test cases after passing 1 and 2?

Question

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
float dollarBills = 0;
float totalHouse = 0;
cin >> totalHouse;
if(!totalHouse>=3)
cout << "Please enter an input greater than or equal to 3" <<endl;
dollarBills = round((3 / 2 * 2 * 100) / totalHouse);
cout << dollarBills << endl;
return 0;
}

Answer 1

if (! (totalHouse>=3)).......

Answer 2

The number inside round is constant why you just typed 300?

Answer 3

Thanks for replying
But I just need to use ceil instead of round