Area and volume SAT question

The correct answer is $2,216$. The surface area of a prism is the sum of the areas of all its faces. A right rectangular prism consists of six rectangular faces, where opposite faces are congruent. It's given that this prism has a length of $28\text{cm}$, a width of $15\text{cm}$, and a height of $16\text{cm}$. Thus, for this prism, there are two faces with area $(28)(15){\text{cm}}^2$, two faces with area $(28)(16){\text{cm}}^2$, and two faces with area $(15)(16){\text{cm}}^2$. Therefore, the surface area, $\text{in}{\text{cm}}^2$, of the right rectangular prism is $2(28)(15)+2(28)(16)+2(15)(16)$, or $2,216$.