Compute for the Total Cost ( show the process) and identify the Big O notation ( apply the rules/properties) of the given program snippet.

Problem Number 1:

class MUlMatrix { public static void main(String args[]) { int r1, r2,c1,c2,i,j,k,sum; Scanner in = new Scanner(System.in); System.out.println("Enter the number of rows of matrix1"); r1 = in.nextInt(); System.out.println("Enter the number columns of matrix 1"); c1 = in.nextInt(); System.out.println("Enter the number of rows of matrix2"); r2 = in.nextInt(); System.out.println("Enter the number of columns of matrix 2"); c2 = in.nextInt(); if(c1==r2) { int mat1[][] = new int[r1][c1]; int mat2[][] = new int[r2][c2]; int res[][] = new int[r1][c2]; System.out.println("Enter the elements of matrix1"); for ( i= 0 ; i < r1 ; i++ ) { for ( j= 0 ; j < c1 ;j++ ) mat1[i][j] = in.nextInt(); } System.out.println("Enter the elements of matrix2"); for ( i= 0 ; i < r2 ; i++ ) { for ( j= 0 ; j < c2 ;j++ ) mat2[i][j] = in.nextInt(); } System.out.println(" output matrix:-"); for ( i= 0 ; i < r1 ; i++ ) { for ( j= 0 ; j