The following information is taken from Goofy Avionics Testing Service:

Number of Total Cost

Tests Performed of Testing

January 61,000 $1,420,000

February 55,000 1,340,000

March 50,000 1,230,000

April 72,000 1,430,000

May 78,000 1,440,000

June 81,000 1,540,000

July 90,000 1,590,000

August 108,000 1,610,000

September 111,000 1,700,000

October 128,000 1,720,000

November 140,000 1,860,000

December 132,000 1,810,000

Required: Using the high-low method, determine the following:

1. The variable cost per test.
2. The total fixed cost of operating the testing facility.
3. Prepare an estimating formula for the cost of tests.
4. The expected cost for a month if 125,000 tests are performed.