Fabio rents a boat from Albert for $$5000$ per month for five years for his fishing

business. After one year Fabio slips and injures his back and is unable to work

more than three days a week. This seriously affects the profitability of his fishing

business. As a consequence, Fabio asks Albert to drop the boat rent to $3,000$

per month. Albert agrees.

Fabio has been unable to work properly for $18$ months. When he recovers his

health and the fishing is profitable again, Albert says he wishes to charge the full

rent for the remainder of the boat rental contract. In addition, he asks Fabio to

repay the rent he had lost because of his promise $($that is $18$ months x $$2000).$

Advise Fabio and Albert of their rights under the contract. Explain the

arguments that Fabio and Albert would make in support of their case.