Anyone help explain and how to do this?

thank you!!

Below are the restated amounts of net income and retained earnings for Volunteers Incorporated and Raiders incorporated for the period 2015 to 2024. Volunteers began operations in 2016, while Raiders began several years earliet. Required: Calculate the balance of retained earnings each year for each company. Neither company paid dividends during this time. (Enter your answers in millions (i.e., 10,000,000 should be entered as 10). Amounts to be deducted should be indicated by a minus sign.)