Any one good at business maths?

Not very good at maths, and got this case study to work on. Its about identifying opportunities for cost reduction.

The question:

'How to establish whether we are getting value for money (and therefore whether there are any other cost reduction opportunities) on commodity Y with a global spend of £10M (The subsidiary split is; £7M, £2M, £1M). There are currently 15 suppliers'

Not really sure where to start, am I looking for economies of scale? How do I put this into an equation?

Please Help!!