What is the volume of the prism?

My answer is 12*16+8=200 I'm pretty sure i did that wrong,Can someone help me w/Understanding on how to calculate this correctly Please & Thank you.

What is the volume of the prism? My answer is 12 16+8=200 I m pretty sure i did that wrong,Can someone help me w/Understanding on how to calculate this correctl class=
What is the volume of the prism? My answer is 12 16+8=200 I m pretty sure i did that wrong,Can someone help me w/Understanding on how to calculate this correctl class=