Use the selected financial data from GEX Company to answer questions :

Inventory$57 million

Accounts receivable52 million

Current assets129 million

Total assets324 million

Accounts payable36 million

Current liabilities61 million

Total liabilities163 million

Total stockholder's equity161 million

Net sales345 million

Cost of goods sold248 million

Operating profit23 million

Income tax expense4 million

Net profit11 million

a, Calculate the current ratio.

b, Calculate the quick ratio.

c, Calculate average collection period.

d, Calculate days inventory held.

e, Calculate the debt ratio.

f, Calculate the operating profit margin.

g, Calculate return on equity.

h, Calculate fixed asset turnover.

i, Calculate the effective tax rate.

j, Calculate net profit margin.