On January 10, Mr. A borrows $1000 on a demand loan from his bank. Interest is Paid at the end of each quarter (March 31, June 30, September 30, December 31) and at the time of the last payment. Interest is calculated at the rate of 12% on the balance of the loan outstanding. Mr. A repaid the loan with the following payments:

March 1 $100

April 17 $ 300

July 12 $200

August 20 $100

October 18 $300

---------

$ 1000

Calculate the interest payments required and the total interest paid.