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If the white board is said to be of size 2*3 , it means it is 2 feet in height and 3 feet in width. It is a rectangular white board.

So its area is equal to 2 ft * 3 ft = 6 ft² 

Cost of white is 120 INR / ft²

Total cost of the white board = Cost per unit area * area of white board
                                              = 120 * 6 = 720 INR