Please provide a written out by hand solution for the above example.

A firm is considering an investment. The most likely data values were found during the feasibility study. The firm's most experienced project analyst has estimated the values for the useful life and salvage value under three scenarios. Use an interest rate of 12% to determine the project's expected present worth. The value is closest to which of the following? Most Likely Optimistic Pessimistic $950 $1000 $1150 Cost Net annual benefit $210 $200 $170 $100 Salvage value Life 12 10 a. 69.6 b. 100 130 C. d. 159.7