You are given the following information about an investment account: i) The account values (before deposit or withdrawal) are $ 100 $100 on January 1, 2017, $ 108 $108 on March 1, 2017, $ 102 $102 on April 1, 2017, $ 118 $118 on T T, 2017 and $ 130 $130 0n January 1, 2018. ii) Deposits of $ 20 $20 and $ X $X are made on April 1, 2017 and T T, 2017, respectively. iii) A withdrawal of 12 12 is made on March 1, 2017. iv) The time-weighted yield is 13.61 13.61, and the dollar-weighted yield rate is 12.04 12.04. Calculate T T.