I need some help with the "paint costs" problem

Question

I am unable to get all the test cases right using the following code :

#include <iostream>
#include <cmath>
using namespace std;

int main() {
int numOfColors;
cin >> numOfColors;
float total = ((40.0 + numOfColors * 5.0) * 1.1);

cout << ceil(total);

return 0;
}

Can anyone please help me solving this problem?

Answer 1

Tried it but still gets error in testCase #3 and #5

Answer 2

Unexpectedly got it right by altering the code a bit :
#include <iostream>
#include <cmath>
using namespace std;

int main() {
int numOfColors;
cin >> numOfColors;
float total = ((40 + numOfColors * 5) * 1.1f);

if (total == (int)total)
{
cout << (int)total;
}
else
cout << (int)total + 1;

return 0;
}

Answer 3

It's weird that ceil was supposed to return integer value but the method worked.
Thank's for the help...