The following data is for Omar's Company for the years ended June 30.2019 and 2020 For 2019 Net Sales= 20.200 End of Yeat receivables, net = 2850 Beginning of year receivables, net 2950 For 2020 Net Sales = 21500 End of year receivables, net = 3200 Allowance for doubtful accounts: End of 2020 85 End of 2019 80 End ot 2018 75 , the account receivables turnover for 2020 : a. 6.60 b.6.78 c.6.789 d. 6.777