How long will it take for $$520$ to grow to $$2,200$ at the following interest rates?

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

$\backslash$table$[[$a$.5\mathrm{.}2\%,,$years$],[$b$.9\mathrm{.}2\%,,$years$],[$c$.17\mathrm{.}2\%,,$years$]]$