the electricity accounts of resident in a very small town are calculated as following: *if 500 units or less are used the test cost is 2 dinars per unit. *if more than 500, but no more than 1000 units are used, the cost is 100 dinars for the first 500 units, and 5 dinars for every unit in excess of 500. *if more than 1000 units are used, the cost is 350 dinars for the first 1000 units plus 10 dinars for every unit in excess of 1000

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