Advanced Synoptic practice assessment 2 - question 1.3

I am really struggling to see how to get to the model answer in question (d) (i).

The model answer gives the Actual contribution for the period as £680,000.

Can anyone help explain how to get to this figure?

I thought it would be £720,000: new selling price of £156 - £120 variable cost = £36 contribution per unit. 20,000 x £36 = £720,000.

In the model answer, the contribution per unit is £34. Is anyone able to explain how to arrive at this answer?
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