This statement<span> makes sense, the </span>money<span> in the </span>account will<span> grow by the same </span>percentage (3%)<span>, which is an </span>example of exponential growth... I don't know if this is the answer that you were looking for, but here it is.
Answer: Dont know the options, but if brushing twice a day is an option, then thats it. 100%