The Mayor of a city is evaluating two transportation projects $$ Project A and Project B$.$ Project A $$ The present

value of the benefits expected from the project is $$40,00,000.$ The present value of costs is $$20,00,000.$ Project

B $$ The present value of benefit expected from the project is $$60,00,000.$ The present value of costs is

$$20,00,000.$ Calculate the benefit$-$cost ratio and evaluate which project should be undertaken.