Apple Blueberry Pie

3/4 cup sugar
1/2 tsp. salt
1 cup fresh blueberries
1 unbaked pie shell
3 tbsp. cornstarch
4 cups apples, peeled and sliced
1 tbsp. lemon juice
2 tbsp. margarine

In large bowl, stir together sugar, cornstarch and salt. Add apples, blueberries and lemon juice; toss to coat the fruit. Turn into pastry lined 9-inch pie plate. Dot with margarine. Add top crust. Seal and flute edge. Bake in a 425°F oven until crust is browned and filling is bubbly.