one Kilogram equals approximately 2.2 lbs (pounds). At 24p per lb, 2.2lbs = 24p * 2.2 = 52.8p i.e. 12.8p more expensive than your kilogram.
40p per kilo is cheaper, here is why, spend 40p on a kilo, 1 kilo = 2.2 pounds, so 40p would get you 2.2 pounds, that works out at just under 20p per pound.
1kg ~= 2.2lb (slightly over) 45p per 1/2 kg = 90 per kg 40p per lb ~= 88p per kg ⇒ 40p per pound is cheaper.
£1.00 = 100p ⇒ 40p as a fraction of £1.00 is 40p/100p = 2/5= 12
40p
Convert to the same units, then the fraction can be simplified: £1 = 100p → 40p/£1 = 40p/100p = 40/100 = 2/5
40p
5 pounds/ 1 pound = 5/1 in fraction
It is: 1/8 of 40p = 5p
40p/100p = 2/5 in fraction
8 5ps make 40p
That's 40p times 5.2 (£0.40) which £2.08 208p
In terms of money: 2/5 of £1 = 40p In terms of weight: 2/5 of 1lb = 62/5oz = 6.4oz