Sankey Diagram question?

[YeahItsMe]

I don't understand sankey diagrams at all and my homework is due for tomorrow. I have the picture with the question in the link, but in case you can't see it, here's the question:

1. The diagram shows what happens to each 100 joules of energy from the coal which is burned in a power station when the electricity is used for lighting.
a) Add the missing figures to the diagram.

https://twitter.com/i/#!/EmmaaaHanforddd...2FeTzyyIRu

All contributions are appreciated.x