Hello all, I am confused on where to go with this problem after a certain point.

Question- What interest rate--to at least one decimal place--compounded weekly do you need to earn to make $8000 double in 9 years?

So far I have done this but not sure if it is correct-

r=8000(1+r/52)^52*9

16000/8000=8000(1+r/52)^52*9

2=8000(1+r/52)^52*9

Any help would be greatly appreciated. Thank you!