Alex has a loan that requires 3 payments to repay the loan. The original loan amount is $22, 000. The interest rate on the loan is an annual effective interest rate of 6%. The 3 payments at the end of the 1st, the 2nd, and the 4th year are $900, $700, and $X, respectively.

(a) Find the value of X.

(b) Find the outstanding loan balance right after the second payment at the end of the 2nd year.