The six-month drug cost saving due to the intervention was $32,164; the incremental labour costs amounted to $52,000 per year. Therefore (after duplicating the former figure in order to convert to annual cost savings), the net annual saving from the intervention was $12,000 (which was reported as covering 'most of the purchase price of the computer software' used in the programme). The purchase price is actually given as about $17,000.