please solve for all parts

Risk and probability Micro-Pub, Inc., is considering the purchase of one of two microfilm cameras, R and S. Both should provide benefits over a 10 -year period, and each requires an initial investment of $4,000. Management has constructed the following table of estimates of rates of return and probabilities for pessimistic, most likely, and optimistic results: a. Determine the range for the rate of retum for each of the two cameras. b. Determine the value of the expected retum for each camera. c. Which camera purchase is riskier? Why? a. The range for the rate of return for camera R is %. (Round to the nearest whole number.) Data table (Click on the icon located on the top-right corner of the data table below in order to copy its contents into a spreadsheet.)