10-10. In the development of a publicly owned, commercial waterfront area, three possible independent plans are being considered. Their costs and estimated benefits are as follows: (10.8) PW ($000s) Plan Costs Benefits $123,000 135,000 99,000 $139,000 150,000 114,000 a. Which plan(s) should be adopted, if any, if the controlling board wishes to invest any amount required, provided that the B-C ratio on the required investment is at least 1.0? b. Suppose that 10% of the costs of each plan are reclassified as disbenefits. What percentage change in the B-C ratio of each plan results from the reclassification? c. Comment on why the rank-orderings in (a) are unaffected by the change in (b)