The electricity accounts of residents in a very small town are calculated as follows: a) If 500 units or less are used the cost is 2 cents per unit; b) If more than 500, but not more than 1000 units are used, the cost is $10 for the first 500 units, and then 5 cents for every unit in excess of 500; c) If more than 1000 units are used, the cost is $35 for the first 1000 units, plus 10 cents for every unit in excess of 1000; d) In addition, a basic service fee of $5 is charged, no matter how much electricity is used. The five residents use the following amounts (units) of electricity in a certain month: 200, 500, 700, 1000, 1500. Write a program which uses logical vectors to calculate how much they must pay.

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