Money invested at x%, compounded annually, triples in value in approximately every 112/x years. If $2000 is invested at a rate of 8%, compounded annually, what will be its approximate worth in 28 years? Pick.
A) $ 3,750	B) $ 5,600	C) $ 8,100	D) $ 18,000	E) $ 22,500

Rationale: "x = 8 % 112 / x years = 112 / 8 = 14 years now , money triples every 14 years therefore , in 14 yrs , if $ 2000 triples to $ 6000 , in 28 years , it will again triple to $ 6000 * 3 = $ 18,000 answer d"
Answer: D