no excel, use formula plz

2. You are given the following information about an investment account: (i) The value on January 1 is 10. (ii) The value on July 1, prior to a deposit being made, is 12. (iii) On July 1, a deposit of X is made. (iv) The value on December 31 is X. Over the year, the time-weighted return is 0%, and the dollar-weighted return is Y. Calculate Y