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A cluster has chartered a bus to Orlando. The driver costs $100, the bus costs $500, and parking in Orlando earn be $75. You keep already remunerated $600 to secretiveness the bus and a driver. The driver's fee is non-refundable, but the bus may be canceled a week in grade at a direct of $50. At $20 per ticket, at meanest how frequent people must buy tickets so that the taunt deficiency not be canceled?