How long will it take for money to double at 6.5% compounded weekly?

Question

I don't know whether I should do 7 guesses or not. I don't know what to put as n, this has been bothering me and I've tried everything. I don't know how to guess and check.

Answer 1

2 = (1 + 0.065/52)^52t

2 = (1.00125)^52t

ln 2 = 52t(ln 1.00125)

0.69314718 = 52(0.00124921)t

0.69314718 = 0.064959408t

10.67046626 = t