1 a) A companys sales in 2018 were $100 million. If sales grow by 8% annually, what will they be 10 years later? What would they be if they decline by 8% per year for 10 years?

1 b) How long might one expect an investment of $800 to pay out at $1,200 if the investment earned a 6% rate of return? Please show step by step