1. Declare a 2-D array with

double[][] m={{10,20,0},{20,40,0}};

2. Write a method computeAvg that will take a double 2-D array as the input, compute the average

of 1st and 2nd columns and put the average result at the 3rd column for each row.

3. Write a method printArray to print the values of the 2-D array. The numbers should be aligned.

4. In your main method, call computeAvg first, then call printArray