Samuel's Field Trials, Inc. expects next year's sales to be $100,000 if the economy is strong, $70,000 if the economy is steady, and $50,000 if the economy is weak. Assume there is a 40 percent probability that the economy will be strong, a 10 percent probability of a steady economy, and a 50 percent probability of a weak economy. What is the expected level of sales for next year? 6-8