Adam invests 1,000 in an account earning simple interest at an annual rate of j. At the end of 10 years, Adam has 2,000 in his account. Belinda invests 1,000 in an account earning compound interest an an annual rate of i. During the 7-th year, Adam and Belinda earn the same annual effective interest rate. Determine the amount Belinda has in her account at the end of the 10-th year.