You own a sand mining business in the outer western suburbs of Brisbane. The quality of your sand is excellent and is the only sand of this quality in Brisbane. Your sand mine operates as a monopoly. You monitor the operations of your sand mine and have collected the following daily information regarding demand. This is shown in Table 1 below. The marginal cost of operating your sand mine has been estimated to be approximately constant at $30/tonne as a result of the nature of your sand mining operations, equipment used, and workforce employed.

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