A company produces lamps, for which the variable cost is $7 per lamp and the fixed costs are $25000. They will sell the lamps for $80 each. Let æ be the number of lamps produced. a) Write an expression to represent the total cost. C(x) = b) Write an expression to represent the total revenue. R(x) = c) Find the number of lamps which must be produced to break even.

The cost (C) of computer monitor is partly constant and partly varies directly as the number of computer monitor (N) produced. The cost is $2000 when 5 computer monitors produced. The cost is $2600 when 7 computer monitors produced. (a) Find the cost (C) in terms of the number of computer monitors (N). (b) Find the cost (C) when 10 computer monitors produced. (c) Find the number of computer monitors (N) produced when the cost is $6500.

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