A teacher invested $600 in an account that paid 2% annual simple

interest. The teacher did not make any additional deposits or

withdrawals.

What is the total amount of interest paid by this investment at the end of

3 years?

multiply then divide

step-by-step explanation:

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: