Need 86 done and factors I dont understand it

Baabak Ashuri, Georgia Institute of et Mark Johnson invests a fixed percentage of his salary end of each year. This year he invested $1500 For the next 5 years, he expects his salary to increase 8% annually, and he plans to increase his savings at the same rate. How much will the investments be worth at the end of 6 years if the average increase in 4-85 4-9 the stock market is (a) 10%? (b) 8%? (c) 6%? 4-86 Zachary has opened a retirement account that will pay 5% interest each year. He plans to deposit 10% of his annual salary into the account for 39 years before he retires. His first year's salary is $52,000,4 and he expects the salary to grow 4% each year. How much will be in his account after he makes the last deposit? What uniform amount can he withdraw the account for 25 years beginning one year from after his last deposit? Contributed by Paul R. McCright, University of South Florida