Why my cost fail in paint cost test

Question

#include <iostream>
#include<math.h>
using namespace std;
int main() {
int a;
float b = 40.00;
float c = 5.00;
cin>>a;
std::cout<<ceilf((b+c*a)/10+b+c*a);
return 0;
}

Answer 1

I had exactly same problem 😏
Then I just replaced ceil with round (you are using ceilf btw)
and casted value to int before printing to console.
generally it was like :
cout << (int) round(that formula);
That worked 🙄

Answer 2

I recommend to use:
float a;
and 10.0 instead 10