(please show me how to do it in excel)

Suppose you work for a software company that has developed a new product. The patent on this product will last for seventeen years. You expect that the product will produce cash-flows of $10,000,000 in its 1st year and that this amount will grow at a rate of 4 percent per year for the next seventeen years. Once the patent expires, your competitors will be able to produce equivalents copies of your software and drive any future profits to zero. If the interest rate is 11 percent per year, then what is the present value of producing this software?