Answer:
The approximate annual expected appreciation rate on home equity (annual EAHE) is 14.87%
Explanation:
loan amount = purchase price*LTV
           = $200,000*0.80
           = $160,000
for n being the number of years:
annual EAHE = (loan/equity)^1/n
            = ($160,000/$80,000)^1/5
            = 14.87%
Therefore, The approximate annual expected appreciation rate on home equity (annual EAHE) is 14.87%