Question

Lee and his wife have subscribed to a mobile plan which allows them to
make a certain number of mobile phone calls for a monthly charge of
USD 300 each. Beyond those calls,
the service provider charges all their
calls at a certain rate per call
. Lee and his wife together made 1400 calls
and were charged USD 425 and USD 925 respectively. However
, if only
Lee would have made all of the 1400 calls he would have been charged
USD 1550. So can you guess, how many mobile phone calls the plan
allows for USD 300 fixed monthly charge?
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Answer 1

I don't know the answer. but the question is only this much big than answer......