Write a C++ program that defines a two-dimensional (3X4) array of integers, input values from the user and then print the elements of the column with the largest sum. Brooke Motors is a small car dealership. On average, it sells a car for $27,000, which it purchases from the manufacturer for $23,000. salespeople are paid a commission of $600 for each car they sell. the company pays a rent equal 20% of total revenues earned during each month. required 1-contribution margin per car 2- calculate breakeven point in units 3-explain your result in requirement 2