SERVICE TO DRUG STORE OPERATORS-NAMELY, PROCESSING OF RECORDS OF PURCHASES BY INDIVIDUAL CUSTOMERS TO COMPILE INFORMATION AS TO ACCOUNTS RECEIVABLE AND THE AGE THEREOF, AND AS TO CATEGORIES OF MERCHANDISE PURCHASED, TO AID SAID OPERATORS IN BILLING AND SUPPLYING SAID CUSTOMERS WITH PROOF OF DRUG, MEDICAL AND SURGICAL SUPPLY PURCHASES QUALIFYING FOR TAX DEDUCTIONS AND MEDICAL INSURANCE PAYMENTS