BPP ACCA Revision Kit pg 65 no 90

I assume that you mean question 190. The total sales are 2,250. Had they been sold at standard mix they would be as follows: X: 800/2,400 x 2,250 = 750 Y: 1,000/2,400 x 2,250 = 937.5 Z: 600/2,400 x 2,250 = 562.5 It may help you to watch my free lectures on this. The lectures are a complete free course for Paper PM and cover everything needed to be able to pass the exam well.

Yes I meant question 190, now it is clear to me I will have a look at your lecture thanks

You are welcome :-)