In April 2001, the families of more than 30 victims received a $2,538,000 settlement in their case against the families of Eric Harris, Dylan Klebold, Mark Manes, and Phillip Duran. Under the terms of the settlement, the Harrises and the Klebolds contributed $1,568,000 through their homeowners policies, with another $32,000 set aside for future claims; the Manes contributed $720,000, with another $80,000 set aside for future claims; and the Durans contributed $250,000, with an additional $50,000 available for future claims. The family of Isaiah Shoels, the only African-American victim, rejected this settlement, but in June 2003 were ordered by a judge to accept a $366,000 settlement in their $250-million lawsuit against the shooters families. In August 2003, the families of victims Daniel Rohrbough, Kelly Fleming, Matt Kechter, Lauren Townsend, and Kyle Velasquez received undisclosed settlements in a wrongful death suit against the Harrises and Klebolds.

Based on the above article, answer a question. How many more dollars did the Manes contribute compared to the Durans?
470000