Answer:
Interest rate of annuity is 7.17%
Explanation:
A fix Payment for a specified period of time is called annuity. The discounting of these payment on a specified rate is known as present value of annuity.
Formula for Present value of annuity is as follow
PV of annuity = P x [ ( 1- ( 1+ r )^-n ) / r ]
$20,000 = $4,900 x [ ( 1- ( 1+ r )^-5 ) / r ]
r = 7.17%
Interest rate is 7.17%