Operational price variance (two approaches in Cima P1 Course Book - BPP)

Dear All! I would like to ask for your help regarding the method of calculating Opeational price variance. I have run into 2 caculation method in my CIMA P1 Course book. Example: Budget: raw meterial cost per unit of product: 2kg of cooper per 1 usd per kg Actual: 1 000 units produced at a cost of 3 250 usd for 2 200 kg of cooper. Material price operational variance: Revised standard cost for revised standard kg for actual output 1 000 * 2 * 1,5 = 3 000 (why not 2200*1,5) Actual cost 3 250 My question relates to the "Revised standard cost for revised standard kg for actual output" part. Why the budgeted usage kg/unit is used instead of the actual usage of kg/unit? In this very book in a different example the actual usage of kg/unit is being used, the same way as OpenTuition tutor is showing it in the video. Can you please tell me under what condition can the budgeted usage kg/unit used in the calculatin of "Revised standard cost for revised standard kg for actual output" part? Thank you in advance for your help. Best regards Alexander