I've seen other answers to this saying its 77 million but their calculations seem off. I could be mistaken but I would like to see a step by step if possible thank you.

A new solid waste treatment plant is to be constructed in Washington County. The initial installation will cost $30 million (M). After 10 years, minor repair and renovation (R\&R) will occur at a cost of $10M will be required; after 20 years, a major R\&R costing $20M will be required. The investment pattern will repeat every 20 years. Each year during the 20 -year period, operating and maintenance (O\&M) costs will occur. The first year, O\&M costs will total \$2M. Thereafter, O\&M costs will increase at a compound rate of 4% per year. Based on a 4% MARR, what is the capitalized cost for the solid waste treatment plant