I need help finding the departmental gross profit percentages and the departmental operating income percentages - I always get them wrong and can't figure out where i'm going wrong.. Makes sense in class and then it goes away once i'm home. Please and thank you.

Chapman Company has divided its business into two departments: Department A and Department B. Directions: Using the income statement below, calculate departmental gross profit percentages and the departmental operating income percentages for each department for the year ended December 31, 20- (Round to two decimal places.) Chapman Company Income Statement For the Year Ended December 31, 20 Dept. A Dept. B $598,420 134,560 $473,860 $329,050 94,440 $234,610 Total $927,470 229.000 $698,470 Net sales Cost of goods sold Gross profit Operating expenses: Store clerks wages expense Delivery drivers wages expense Advertising expense Store rent expense Bad debt expense Depreciation expense delivery equipment Other operating expenses Total operating expenses Operating income $ 74,595 50,450 10,230 4,500 4,488 $ 60,300 58,900 6,420 3,500 2,468 $134,895 109,350 16,650 8,000 6,956 6,575 89,325 240.163 $233,697 1,750 35,680 169,018 $ 65,592 8,325 125,005 409,181 $289,289 Departmental Gross Profit Percentages: Department A Department B Departmental Operating Income Percentages: Department A Department B