One of the byproducts of nuclear power generation is Uranium-233. Uranium is decaying at a constant 32% rate per day. If 12,880 pounds are produced from a power plant, what will the amount be in 20 days?

A 21.4009

B 644.208

C 6955.200

D 8243.563

We make use of the equation,

amount in days = original amount x (1 - rate of decay) ^ n

where n is the number of days.

Substituting the known values,

amount = (12,880 lbs) x (1 - 0.32) ^20

= 5.755 lbs

The answer should be 5.755 lbs which is not among the choices.