A new entrepreneur is planning to open a juice bar. According to his accountant's predicted estimations the business projected yearly revenue would be $70000, the rent expense would be $20000 p.a., new equipment cost $25000 p.a. and the wage bill would be $20000 p.a. It is also known that to engage in this new business venture the entrepreneur must give up his current job currently paying $30000 p.a. and invest his own funds into the business which currently return $10000 p.a. in interest.

Assume that estimated yearly revenue increases to $100000 p.a. due to possible lifting of quarantine lockdowns. Calculate the economic rent of the decision to open a juice bar using the new estimated revenue. Explain whether the decision to open a juice bar is viable after the lockdown has been lifted.