What is the surface area of this design?

that is option 2nd is correct.

Step-by-step explanation:

The surface area of cuboid is:

Here, both the shapes are cuboid:

Length is 5 in

Height is 8 in

Breadth is 5 in

And in the other figure

Length is 10 in

Breadth is 10 in

Height is 2 in

Substituting the values in the formula we get:

For first figure:

And for second figure:

Now adding areas of both the figures we get:

210+280=490

Therefore, Option 2nd is correct.

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step-by-step explanation: