Bruce and Robbie each open up new bank accounts at time 0. Bruce deposits 500 into his bank account, and Robbie deposits 300 into his. Each account earns the same annual effective interest rate. The amount of interest earned in Bruce's account during the 6th year is equal to X. The amount of interest earned in Robbie's account during the 17th year is also equal to X. Calculate X. O 30 40 O 50 O 60 070