Cabbage and Broccoli Slaw with Vinegar Dressing

1 (10 ounce) package shredded purple cabbage

1 (10 ounce) package broccoli coleslaw mix

1 (8 ounce) container grape tomatoes

halved

2 tablespoons rice vinegar

1 tablespoon olive oil

½ teaspoon white sugar

¼ teaspoon salt

⅛ teaspoon garlic powder

⅛ teaspoon ground black pepper

3 scallions

sliced

¼ cup dried cranberries

¼ cup sliced almonds