The Spot of RUB (Russian Ruble, RUB/USD) is now .017. It has been traded between .015 and .017. With current news, you expect it to go down to .015 again in next 15 days. (D=15) With borrowing capacity of 100 million RUB and 10 Million USD, show me the speculative profit, if you are right. The borrowing rate for RUB is 7% and 5% for USD. The lending rate for RUB is 6% and 4% for USD. Your local currency is USD and answer the question in USD. No currency symbols with two decimals.