Megan’s cousin wants to buy a new sound system for his car. She goes to the electronics store to help him to pick it out. The base system costs $395. Adding a subwoofer is an additional $89. Two extra rear speakers are $75 each. And upgrading to a six-CD disk changer is an additional $225. Round each amount to the nearest hundred dollars to find a reasonable estimate for the total cost of the new sound system.