Problem $02\mathrm{.}049-$ Calculation of unknown interest rate

An A&E firm planning for a future expansion deposited $$42,000$ each year for $5$ years into a sinking $($investment$)$ fund that was to pay

an unknown rate of return. If the account had a total of $$456,000$ immediately after the fifth deposit, what rate of return did the

company make on these deposits?

The rate of return that the company made was