Help with arrays and matrices!

[chwex]

I am currently stuck with this problem...

Write a program for the next problem. A store sells the following products: Milk, soap, meat, beans and tomatoes. The cost of each product is $12.5, $18.2, $69.9, $30.5 y $15.9 respectively. The price for the costumers is 30% more than the cost of the product.

Randomly create numbers from 0 to 10 which will represent the quantity sold of each product each day for a whole month.
The owner wants to know the total sales for each product in a day and the whole month, the total sales of each day and which product gives the most profit for the month.

So far I have created an array that holds the string names, the cost of each product and the price for each costumer. I got stuck on the matrix part where I need to place a vector inside each element... After that I need to start doing the operations inside the matrix such as, accumulators and counters... I started this without guidance, so I don't know if I have the right approach. So far this is what I have.
Thanks in advance!

public static void main(String[] args) {
       int x=0, y=0, z=0, number=0;
       Double precio[];
       String[] productos = {"leche", "jabon", "carne", "frijol", "tomate"};
       Double[] costo = {12.5, 12.2, 69.9, 30.5, 15.9};
       precio = new Double[5];
       Random num = new Random();
       int mmes[][] = new int [5][6];
       
       
       for(x=0; x<=4; x++){
           precio[x] = costo[x]+(costo[x]*.30);
           
           System.out.println(precio[x]);
       }
       
       for(x=0; x<=5; x++){
           for(y=0; y<=6; y++){
            
               mmes[x][y] = precio[z];
               for(int counter=1; counter>=10; counter++){
                   number = num.nextInt(11);
                   System.out.println(number + " ");
               }
           }
       }
       
        
    }

}

[Ronin]

Hi chwex,

I'm assuming you want something basic for this problem.
You could use a two dimensional array which holds the number of each product sold where each row represents a different item whilst each colums represent a day.
In effect you would use a 5 by 30/31 array to hold the values. The months can get a bit messy though as the actual number of columns required is dependant on the number of days in the month.

Regards.

[chwex]

Thanks for the response Ronin! I appreciate it! I will try your approach since it seems a bit easier than the one I had in mind!

[Ronin]

You're welcome.