£2 = 200 pence
40/200 = 4/20 = 2/10 = 1/5
one fifth
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It is: 1/8 of 40p = 5p
1kg ~= 2.2lb (slightly over) 45p per 1/2 kg = 90 per kg 40p per lb ~= 88p per kg ⇒ 40p per pound is cheaper.
To work it out you need to divide 40 by 5 then multiply your answer by 2 so the answer is 16
4p
40p