S pot an arbitrage opportunity $($if it exists$)$ in the following situation. Suppose that a dealer A offers to buy british pounds in an year from now at a rate of Rs$.79,$ while dealer B would sell British pounds immediately at a rate of Rs$.80$ a pound. Assume that a rupee can be borrowed at an annual rate of $4\%$ and a British pound can be invested in a bank at $6\%$ annual interest.