Answer:
2.55%
Explanation:
Let us think of the rental cost as a growing perpetuity. Therefore Using the formula for the present value of growing perpetuity, we want to find the growth rate g so that:
$491,000=$19,400/6.5%-g
Or
Equivalent 6.5% -$19,400/$491,000
Hence:
6.5% -3.95%
=2.55%
Therefore the rental costs must grow at a rate of 2.55% per year for the cost of renting to be comparable to the cost of purchasing the warehouse.