A telephone company makes up its monthly bills as follows: a fixed charge of 800 naira plus a charge proportional to the number of units of call on the telephone .If it charge 2 naira per unit of call , calculate the total charges on (a) 80 units (b) 150 units (c) 782 units

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  1. cost = 800 + 2u , where u the number of units of call

    a) so if u = 80
    cost = 800 + 2(80) = 800 + 160 = 960

    b) if u = 150

    c) if u = 782

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