Interest rate. In $1972,$ Bob purchased a new Datsun $240Z$ for $$3,400.$ Datsun later changed its name to Nissan, and the $1972$ Datsun $240$ Z became a classic. Bob kept his car in excellent condition and in $2002$ could sell the car for six times what he originally paid. What was Bob's annualized rate of return for the $30$ years he owned this car? If he keeps the car for another thirty years and earns the same rate, what could he sell the car for in $2032?$

What was Bob's annualized rate of return for the $30$ years he owned this car?

$\%($Round to two decimal places.