Machine A costs $850.000 and would produce cash flows of $220,000 per year for the first two years. $350,000 per year for the next two years, and $150,000 in the final year. Machine B costs $650,000 and would produce cash flows of $250,000 per year for the first two years, $200,000 the following year. $150,000 in its fourth year, and $140,000 in its final year. Your required return is 11%. What is the NPV of buying machine B