ON HER 21ST BIRTHDAY, mARIE RECEIVED A LUMP SUM OF MONEY. aT THAT TIME SHE DECIDED TO INVEST ITAT A FIXED ANNUAL INTEREST RATE,COMPOUNDED YEARLY, UNTIL HER 30TH BIRTHDAY. oN HER 25TH BIRTHDAY HER INVESTMENT HAD GROWN EXPONENTIALLYTO $11,360.08. oN HER 30TH BIRTHDAY IT HAD FURTHER GROWN TO $16.691.69. rounded to the nearest tenth of a percent what was the fixed annual interest over this 9 year period/rate

Question

ON HER 21ST BIRTHDAY, mARIE RECEIVED A LUMP SUM OF MONEY. aT THAT TIME SHE DECIDED TO INVEST ITAT A FIXED ANNUAL INTEREST RATE,COMPOUNDED YEARLY, UNTIL HER 30TH BIRTHDAY. oN HER 25TH BIRTHDAY HER INVESTMENT HAD GROWN EXPONENTIALLYTO $11,360.08. oN HER 30TH BIRTHDAY  IT HAD FURTHER GROWN TO $16.691.69. rounded to the nearest tenth of a percent what was the fixed annual interest over this 9 year period/rate

anonymous · Answer

ick. solve 
$$16,691.69=11,360.08e^{5r}$$ for r to give you the rate

anonymous · Answer

divide by 11,360.08
take the log
divide by 5