Answer:
10.53%
Step-by-step explanation:
In this question, we use the RATE formula that is shown in the attachment. Kindly find it below:
Data provided 
Present value = $34,500
Future value or Face value = $0
PMT = $4,200
NPER = 11 years × 2 = 22 years 
The formula is shown below: 
= Rate(NPER;PMT;-PV;FV;type) 
The present value come in negative 
So, after solving this, the rate of return is 10.53%