A school purchased 2 computers whose prices were $1,000 and$2,000, respectively. The school is to purchase 2 more computers from a list of computers whose prices range from $1,000 to$2,000, inclusive. The greatest possible average (arithmetic mean) price of the 4 computers is how much greater than the least possible average price of the 4 computers?

$250$500

$750$1,000

\$1,250