Aright rectangular prism has a length of 20.2 cm, a width of 9.1 cm and a height of 14.3 cm. what is the surface area of the right rectangular prism. need asap

To find this the first step we do is multiply the length by the height (20.2 x 14.3) to get 288.86.  Now there are 2 sides just the same so together it would be 577.72.  Next is width times height.  9.1 times 14.3 to get 130.13 then times that by 2 to get 260.26.  So far we have this 577.72 + 260.26 + (length times width).  20.2 times 9.1 is 183.82 then times that by 2 to get 367.64.  Now we add all of them to get 1205.62 cm^2.  The surface area of the right rectangular prism is 1,205.62 cm^2.  If this is wrong please let me know so I can research more on the subject.  Thanks :)

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