A major pharmaceutical company sells £400 million worth of medicine per year. Average amount of customer bills in accounts receivable is £100 million. What is the average time from the time a customer is billed to the time payment is received? O a. 24 months or 2 years O b. 12 months or 1 year O c. 3 months or 0.25 years O d. 6 months or 0.5 years 4