Here's the question you clicked on:
douglas12
The amount of money in an account with continuously compounded interest is given by the formula A = Pe^rt, where P is the principal, r is the annual interest rate, and t is the time in years. Calculate to the hundredth of a year how long it takes for an amount of money to double if interest is compounded continuously at 6.5%. A. 21.33 years B. 7.11 years C. 5.33 years D. 10.66 years
Have you considered A = 2P?
Also, consider the Rule of 72. 72/6.5 = 11.077 I'm kind of leaning toward D, already.
I don't know. You tell me. Use the first hint and calculate the exact value,