A telephone company makes up it's 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 its charges 2 naira per unit of call, calculate the total charge on 80 units,150 units and 782 units
of call.
80 units: 800 naira + (2 naira x 80 units) = 800 naira + 160 naira = 960 naira
150 units: 800 naira + (2 naira x 150 units) = 800 naira + 300 naira = 1,100 naira
782 units: 800 naira + (2 naira x 782 units) = 800 naira + 1,564 naira = 2,364 naira