Monthly electricity costs (in dollars) are based on the number of kilowatt hours (KWH) used. The cost for using 500 KWH is $50. The cost for using 800 KWH is $300. The graph of cost function c() is shown below. 300- 250- 200- 150- 100- 50- 0400 500 600 700 8 800 C(x) 100 200 300 400 500 Write a formula for the cost function c(a) for a greater than 500 KWHS.

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