Question 1014126
you earned 300 in half a year.


that's an interest rate of 300/7700 = .038961039 for a half a year.


multiply that by 2 to get a nominal interest rate of 2 * .038961039 = .0779220779 per year.


multiply that by 100 to get an interest rate of 7.79220779% per year.


round that to a tenth of a percent to get 7.8% per year.