A Ltd. and B Ltd. are partners in the Triple M partnership. A Ltd. and B Ltd. share equally in the income or loss of the partnership annually. The partnership earns business income of $100,000 and $300,000, respectively, for its years ended June 30, 2022, and June 30, 2023. Income from the Triple M partnership is A Ltd.’s only source of income for its year ended December 31, 2022. In 2021, A Ltd. accrues, and includes in income, $20,000 of stub period partnership income. 

Determine the amount of business income to be reported for tax purposes by A Ltd. for its year ended December 31, 2022.