We just received a new lease from our landlord. Six months ago when we signed our lease it specified the rent in colones with US dollars in parentheses. When the exchange rate was 500:1, this made sense, but now it doesn't. Our landlord has asked for this month's rent in dollars, which comes out to a lot more than if we paid him in colones. What are we legally obligated to do? Thanks! Have to sign a new lease and I want to be clear on our responsibilities.