Sales revenue Cost of goods sold Net profit Non-current asset Inventory Account Receivable Cash Account Payable Long term liability Shareholders' equity 2016 $30000 $18000 $3000 $5000 $8000 $4000 $6000 $9000 $1000 $13000 2017 $50000 $40000 $1000 $12000 $20000 $6000 $8000 $10000 $4000 $30000 a) Calculate the gross profit margin and net profit margin in 2016 and 2017, and compare the profitability between 2016 and 2017. b) Calculate the inventory turnover in 2016 and 2017. What does your answer imply