(1 point) (Exercise 7.28) An investor deposits 50 in an investment account on January 1 . The following summarizes the activity in the account during the year: On June 30 the value of the account is $180.49. On December 31 the value of the account is X. Using the time-weighted method, the equivalent annual yield during the first 6 months is equal to the the time-weighted yield during the entire 1-year period. Calculate X