To work it out you need to divide 40 by 5 then multiply your answer by 2
so the answer is 16
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1kg ~= 2.2lb (slightly over) 45p per 1/2 kg = 90 per kg 40p per lb ~= 88p per kg ⇒ 40p per pound is cheaper.
£2 = 200 pence 40/200 = 4/20 = 2/10 = 1/5 one fifth
8p 40/5 = 8
It is: 1/8 of 40p = 5p
£1=100pence. Find one fifth by 100/5. Multiply answer by 2. Two fifths of £1 is therefore 40p.