Coin/Money change code doesn't give exact change!

[math8]

hmmm, let see. Maybe something like:

for(int i=0; i<=n/10;i++)
{
    if((n-(i*10))%25 ==0)
    {
              x=i;             //number of 10's
              z=(n-(i*10))/25 ; //number of 25's
              break;
     }
}