A new storm drainage system must be constructed right away to reduce periodic flooding that occurs in a city that is in a valley, Five mutually exclusive designs have been proposed, and theit present...

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Extracted text: A new storm drainage system must be constructed right away to reduce periodic flooding that occurs in a city that is in a valley, Five mutually exclusive designs have been proposed, and theit present worth (in thousands of dollars) of costs and benofits are the following. a. Which system has the greatest B-C ratio? b. Which system has the largest incremental B-C ratio (based on differences between alternatives)? c. Which system should be chosen? System 1. PW of S900 $5,000 $9,000 55 000 $13.000 costs 6,000 24.000 PW of benefits 6,000 14,000 17,000 a. System 1 has the greatest B-C ratio, which is 667 (Round to two decimal places) b. System has the largest incremental B-C, which is (Round to two decimal places )