If the annual interest on a principal is 16%, how many years before the amount is double?	Choose one:  A) 6.25  B) 20  C) 17.2  D) 15.2  E) 15.2
P = (P*16*R)/100   R = 6.25   6.25nswer: 6.25
<result>A</result>
If the annual interest on a principal is 16%, how many years before the amount is double?