An element with mass 800 grams decays by 8.2% per day. How much of the element is remaining after 15 days, to the nearest 10th of a gram?

Given:

The initial mass of an element is 800 grams.

Decay rate = 8.2% per day

Number of days = 15

To find:

The remaining element after 15 days.

Solution:

The exponential decay model is

Where, a is the initial value r is the rate of interest and t is time period.

Putting in the above formula, we get

Therefore, the mass of the remaining element is 221.7 grams.

i think it's either c or d

step-by-step explanation: the entire question is extremely odd. 04 obviously refers to the interest rate. honestly i will say the answer is c. because the (2 x 12) part would mean it's compounded semiannually. i'll say choose c.