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Charlie Stork rented a truck for his business on two previous occasions. Since he will soon be renting a truck again, he would like to analyze his bills and determine how the rental fee is calculated. His two bills for truck rental show that on September $1,$ he drove $1,000$ miles and the bill was $$1,500,$ and on December $5,$ he drove $600$ miles and the bill was $$1,380.$

$\backslash$table$[[1,000$ miles,$$1,500$