which of the followings would not affect the operating margin ratio

a.

change in gross profit

b.

Change in interest expense

c.

change in operating expenses

d.

change in sales

receivable days turnover in 2018 was 60 days. which is correct related into 2019

a.

improving the receivable days into 45 would be more efficient

b.

no statement is true

c.

keep it the same

d.

improving the receivable days into 75 would be more efficient