At a certain period of time the ratio of principal and amount is 9 : 17 at a certain rate of simple interest, after 8 years this ratio will become 3 : 7. Find the rate of interest.
1
\(4\frac{4}{9}{\rm{\% }}\)
2
\(5\frac{5}{9}{\rm{\% }}\)
3
\(2\frac{{16}}{{17}}{\rm{\% }}\)
4
3%
5
\(2\frac{4}{9}\% \)