A company that produces a single product had a net operating income of $87,000 using variable costing and a net operating income of $119,240 using absorption costing. Total fixed manufacturing overhead was $57,120 and production was 11,200 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.)

a) decreased by 6,322 units

b) increased by 6,322 units

c) increased by 32,240 units

d) decreased by 32,240 units