An account is governed by a simple discount function where r = 0 at the start of 2010 and the rate is d = 5%.
a) $200 is placed in the account at the beginning of 2010. What is the value of the investment at the start of 2015? (round to 2 decimal places)
b) A second investment is made at the beginning of 2016. The value of this second investment at the beginning of 2017 is $500. What is the total amount of money (from both investments) in the account at the beginning of 2020?