#include <stdio.h>
#include <stdlib.h>

int main()
{
    float total = 300.0f;

    float val = 30.0f;

    float percentage = val / total * 100.0f;

    printf("%.2f%%\n", percentage);

    printf("%% %% %%%%\n");

    return 0;
}

/*
output:

10.00%
% % %%

*/