Which is cheaper?

[crowdpleeser]

I'm trying to figure out which is best value for money:

10kgs of cat litter for �1.69

or 32 litres of cat litter for �7.50?

Alternatively, if you know of anywhere in London I can buy cat litter for a lot cheaper than these two prices, I'd be grateful!

Thankyou.

[BigMac]

A bit tricky, as one is measure of weight and the other is a measure of volume.

To answer your question, you need to know how much one litre weighs, or the volume of 1kg (how many litres it fills).

[crowdpleeser]

Thankyou for stating the obvious. This is why I asked the question!!!!!!!!

[BigMac]

Sorry I tried!! Let's try again. This is how to work it out...

Let's assume you have a cat.

Let's further assume you already have some cat litter.

Get some cat litter in a receptacle you know contains a volume of one litre - perhaps an ice-cream tub.

Weigh it.

Let's then assume that it weighs one kilo.

7.50/32 = 23.5p per kilo
1.69/10 = 17p per kilo

In this example the 10kg bag is cheaper.

If one litre of cat litter weighs 500g, then 32 x 0.5 = 16kg; divide 7.50 by 16 and the 10kg bag is still cheaper.

If one litre of cat litter weighs 2kg then 32 x 2 = 64kg; divide 7.50 by 64 to give just under 12p per kilo - so the 32 litre bag works out cheaper.

[Catso]

But the value of the litter is surely also dependent on its absorbancy?

It would be better to test how long each bag lasts you (assuming the number of cats & usage remains constant) as a measure of 'quantity' rather then weight or volume.

[kujawski]

you need to purchase a CRAY super computer to work out the dynamics of your cats toilet activities.

[deso]

Or use porridge oats. Compare the cost by weight first. They're certainly very absorbent.