Carl puts 10,000 into a bank account that pays an effective annual interest rate of 4% for ten years , with interest credited at the end of each year.If a withdrawal is made during the first five and one -half years ,a penalty of 5% of the withdrawl is made.Carl withdraws K at the end of years 4,5,6 and 7.The balance in the account at the end of year 10 is 10,000 .Calculate K.