suppose that at tlie beginning of the year, a vermont maple syrup distributor found that the demand for maple syrup, sold at $15 a quart, was 500 quarts each month. at that time, tlie price was going up at a rate of $0.50 a month, but despite this, the demand was going up at a rate of 30 quarts a month due to increased advertising. how fast was the revenue increasing?



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