The metro system in Chepe City is new, so the government has decided not to sell tickets but to charge a flat amount to each of the 1,000 users in the city. Also, the government does not have any clear way to check if all the 1,000 users have paid the monthly share. If the individual share is $30 per month and the monthly total cost of the metro system is $24,000 , what is the maximum number of free riders who can be tolerated by the government without having a negative balance in a month
