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Question: mr robert bought a prepaid card that gives free 100...

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Mr Robert bought a prepaid card that gives free $100 credit can be used for both outgoing calls and local SMS. The calls are charged at $0. 18per minute and the SMS are charged for $0.05.


a) How long does Mr Robert can make an outgoing call for $100 worth of credits?
b) How many SMS can Mr Robert send in $100 worth of credits?

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