Evaluate the following using the present worth comparison method. Use an annual interest rate of 10% and a period of 20 years for both cases.

a) An initial cost of $87,000,000 investment with a first-year operation and maintenance (O&M) cost at $2,000,000, increasing by $250,000 annually. The expected revenue in the first year is $6,900,000, increasing by 8% annually.

b) An initial cost of $101,000,000 investment with a first-year operation and maintenance (O&M) cost at $2,300,000, increasing by $300,000 annually. The expected revenue in the first year is $8,800,000, increasing by 8% annually.

c) Which option is better?