In a small town it has been discovered that the relationship between the number of radios demanded varies linearly with its price. When the price per radio was $15, 1000 radios were demanded; when the price was $30, 700 radios were demanded.
(a) Determine the price per radio when 500 radios were demanded,
(b) above what price will the demand be zero?
(c) Why isn t the demand infinite when the price is zero?