Please choose the correct statement. If Redwood, Inc. sells two products with a sales mix of 70% and 30%, and the respective unit contribution margins are $300 and $450, then weighted-average unit contribution margin is $345. If Redwood, Inc. sells two products with a sales mix of 75% and 25%, and the respective unit contribution margins are $250 and $400, then weighted-average unit contribution margin is $345. If Redwood, Inc. sells two products with a sales mix of 85% and 15%, and the respective unit contribution margins are $300 and $450, then weighted-average unit contribution margin is $345. If Redwood, Inc. sells two products with a sales mix of 75% and 25%, and the respective unit contribution margins are $300 and $450, then weighted-average unit contribution margin is $345