Keeping track of cash amounts in a data structure .

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Hello All I am working on a C# console application where I have to represent money and display how many bills were used to make each amount. I can do this The only problem I am working on figuring out is recording the number of each bill that has been used and to subtract it for the current number. So this is what I have come up with and it has done everything right except for I did a value of 258 and it gave me a ten with the other correct values. It just gave me a extra 10 but everything else I tried worked.. I have an array of the amount of bills I have to be used.
I am subtracting a bill each time i use one.
my 100s are working but when I go to the next bill the remainder is wrong so i cant move on here is some of the stuff i tried..

public static void countbills(int amount, int[] bills, int[] billsCount)
        {
            int remainder = amount;
            int billIterator = 1;
            for(int i = 0; i < billsCount.Length; i++)   // while(remainder > 0)
            {
                //if(remainder >= bills[billIterator])  //{  if(billsCount[])  }
                if (remainder >= bills[i])
                {
                    if (billsCount[i] != 0)
                    {
                        billsCount[i]--;
                        remainder -= bills[billIterator];//bills[i] * billsCount[billIterator];
                        billIterator++;
                        //= bills[i];//amount / bills[i];     //remainder -= counts[bill] * dollarSizes[bill]; //reminder = amount % cashBills[billrem];
                        //amount -= billsCount[i] * bills[i];
                        //billsCount[i]--;
                    }
                }
            }
        }

What I have tried:

I am getting the users input and Ill get a number and I want to minus the number of bills that were used to make that amount and to keep track.


Keeping track of what has been used in a variable so I can minus the dollar bills used and then I want to restock but thatll be easy after i figure this part out