The surface area of a rectangular prism can be calculated by using the following formula:
Where "l" is the length, "w" is the width and "h" is the height.
In this case, you can identify that:
![\begin{gathered} l=24\operatorname{cm} \\ w=20\operatorname{cm} \\ h=15\operatorname{cm} \end{gathered}]()
Therefore, you can substitute values into the formula and evaluate, in order to find the surface area of this rectangular prism:
![\begin{gathered} \\ SA=(2)(20\operatorname{cm})(24\operatorname{cm})+(2)(15\operatorname{cm})(24\operatorname{cm})+(2)(15\operatorname{cm})(20\operatorname{cm}) \\ SA=960\operatorname{cm}^2+720\operatorname{cm}^2+600\operatorname{cm}^2 \\ SA=2280\operatorname{cm}^2 \end{gathered}]()
Hence, the answer is:
![SA=2280\operatorname{cm}^2]()