The general formula of a pyramid with any base is 1/3 bh where b is the area of the base and h is the height. In this case, the height of the pyramid is said to be twice the height of the prism, h. Hence the area becomes 1/3 b*2h or equal to option A. 2/3
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the difference from 40000 to the future value in 2020, namely 5 years later is simply the yield or interest amount.

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I believe the answer is C. I'd have to work this out on paper to be certain, but from what i worked out mentally, i got C. lol
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