CM CLub - how much should i charge for weekends? Need an answer ASAP please

[santasaltire]

The parents of the boy i mind through the week have asked me if i could have him and his siter for two hours today, as they need to Christmas shopping without them. Although my registration covers weekends, i've never actually minded anyone then. Whats the usual rates for weekends, should i charge them double the hourly rate? or more?
They will be here in 30 minutes, and i need to know. Thanks

i'd charge double. but then i wouldnt actually work it i dont think.

Thanks lovemygirls. I never usually do weekends. it's only because DH is away so i'm not doing anything. Also because the wee boys mum works till 10pm every night, and the dad during the day they need to get their shopping done minus children!