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(a) 

From the graph, 0 min needs to pay $20 and 300 minutes talk time needs to pay $ 50.

So mobile phone charge per min =   (50 – 20 ) /   (300 – 0 )   $/min=  0.1 $/min

(b) 

Pls remember to minus off minimum charge of $20 before calculation of talk time.

Ali talk time = ( 51.8 – 20 ) / 0.1 min = 318 min

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