a 50 meter tunnel must be constructed for a new city aqeduct. one alternative is to builf a full-capacity tunnel now for $500,000. The other alternativ is to build a half-capacity tunnel now for $300,000 and then to build a second parallel half-capacity tunnel 20 years hence for $300,000. The cost to repair the tunnel lining every 10 years is $20,000 for the full-capacity tunnel and $16,000 for each half-capacity tunnel. Determine whether the full-capacity tunnel or the half-capacity tunnel should be constructed now. Solve the problem by the conventional benefit-cost ratio analysis, using 4% interest rate and a 50-year analysis period. There will be no tunnel lining repar at the end pf the 50 years.