The top and bottom faces are each 4-ft by 4-ft.
Their areas are each (4 x 4) = 16 ft².
Total for top and bottom faces = (2 x 16 ft²) = 32 ft².
All four side-faces are 4-ft by 10-ft.
Their areas are each (4 x 10) = 40 ft².
Total for the four side faces = (4 x 40 ft²) = 160 ft² .
Total area of (top and bottom) + (4 sides) =
32 ft² + 160 ft² = 192 ft²