Gaston bought a house for $500,000. He gave $100,000 of is own money and he took a loan from a bank for $400,000 to be repaid over 20 years, due on March 8, 2040, at a 4% interest rate. The principal amount of the loan is ___________ and the maturity date of the loan is ________________. $500,000; 20 years $400,000; 20 years $400,000; March 8, 2040 $100,000;March 8, 2040