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See my post to your previous question. The best methodology depends on the actual numbers and values given in the question. This is a question that is structured so that there is a more difficult way and a less difficult way.
The less difficult way.
Calculator: 12 Euros; Â£8.40
Pen: 22 Euros; Â£15.40
Difference: 10 Euros; Â£7.00
You want the price of a 10 Euro cap.
Therefore answer is Â£7.00
Edit: Hope you can follow above, was typed in clear columns, but formatting disappeaered when posted.