As used in Title 392 WAC, "low-income student" means a student whose parent(s) or guardian(s) have an annual income equal to or less than one hundred eighty-five percent of the Income Poverty Guidelines published by the United States Department of Health and Human Services in Federal Register No. 220-91 56FR6859 or as later amended (i.e., the standard adopted by the United States Department of Agriculture for reduced priced meals).