【单选题】Martin invested $1,000 six years ago and expected to have $1,500 today. He has not added or withdrawn any money from this account since his initial investment. All interest was reinvested in the accou...
A.
Martin earned simple interest rather than compound interest.
B.
Martin earned a lower interest rate than he expected.
C.
Martin did not earn any interest on interest as he expected.
D.
Martin ignored the Rule of 72 which caused his account to decrease in value.
【单选题】According to the author, if $1 billion were invested in the prevention and treatment of heart discase, which of the following economic benefits would be produced?