Answer: $120,000
Explanation:
Common stock cannot be cumulative. You most likely meant Preferred stock.
Cumulative stock will see its dividends accrued from years it was not paid to a year it can be paid.
Preferred cumulative stock = (800,000 * 5%) * 3 years including (2019, 2020 and 2021)
= 40,000 * 3
= $120,000