Problem $4-5$ Calculating the Number of Periods $[$LO $4]$

Solve for the unknown number of years in each of the following:

Note: Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\backslash$table$[[$Present Value,Years,Interest Rate,,Future Value$],[500,,,\%,1,355],[2,191,,,\%,3,950],[33,305,,12,\%,389,620],[33,000,,19,\%,205,772]]$