1. The problem statement, all variables and given/known data The total reserves of a nonrenewable resource are 600 million tons. Annual consumption, currently 20 million tons per year, is expected to rise by 1% each year. After how many years will the reserve be exhausted? Part 2. Instead of Increasing by 1% each year, suppose consumption was decreasing by a constant percentage per year. If existing reserves are to never be exhausted, what annual percentage reduction in consumption is required? 2. Relevant equations Ʃar^n Geometric series 3. The attempt at a solution i know that the common ratio r=1.01 I'm just not really sure how to write a geometric series summation to fit the problem. I also am having a difficult time starting part B.