4p
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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.
1 tenth of 1.27 = 0.127
1 tenth of 45p = 4.5p
£1=100pence. Find one fifth by 100/5. Multiply answer by 2. Two fifths of £1 is therefore 40p.