Risk and probability Micro$-$Pub, Inc, is considering the purchase of one of two digital cameras, $R$ and $S,$ each of which requires an initial investment of $$5,000.$ 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 return 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.$)$