A project with 10-year life requires an initial investment of $40000. The annual cost of the project is $3500 while the annual revenue is $15500. There will be an additional investment of $5000 in year 5. Assume that the salvage value at the end of usage life is $10000. At which MARR value, the project is economically viable? If necessary, you can choose more than one options. O a. 30% O b. 50% O c. 40% O d. 20%