thanks so much

Hox manages a large fund. In 2020, the following data are available: Balance on 1/1/20: $3,000,000 Deposit on 7/1/20: Withdrawal on 10/1/20: $600,000 Balance on 12/31/20: $2,800,000 If the Dollar-Weighted Rate of Return for 2020 was 7.2%, find X C