the number of e. coli bacteria cells in a pond of stagnant water can be represented by the function below, where a represents the number of e. coli bacteria cells per 100 ml of water and t represents the time, in years, that has elapsed.

based on the model, by approximately what percent does the number of e. coli bacteria cells increase each year?

a.
59%
b.
41%
c.
60%
d.
40%

see photo for equation