Imagine.. A $50 mobile phone plan.
Mobile calls 10c per 30 seconds.
Land Line calls 29c per 30 seconds.
A customer states "30% of my calls are to mobiles, the other 70% are to landlines, how many hours of talk time (in decimal) do I get for mobile calls and landline calls?"
I need an equation for this to which I could apply if the percentages changed to say 15% and 85%.
By the way I need a response I can understand...Im no maths genius. Thanks