A company that produces a single product had a net operating income of $86,000 using variable costing and a net operating income of $117,110 using absorption costing. Total fixed manufacturing overhead was $56,610 and production was 11,100 units both this year and last year. Last year was the first year of operations. Between the beginning and the end of the year, the inventory level: (Do not round intermediate computation and round your final answer to nearest whole number.) decreased by 31,110 units increased by 31,110 units decreased by 6,100 units increased by 6,100 units