Mom's Rhubarb Cake

INGREDIENTS

• 2 cups all-purpose flour
• 1/4 cup brown sugar
• 1 tablespoon baking powder
• salt
• 1/2 cup margarine
• 2/3 cup evaporated milk
• 1 egg, beaten
• 2 pounds rhubarb, cut into 1/4 inch slices
• 1 (3 ounce) package raspberry flavored Jell-O® mix
• 1 cup white sugar, divided
• 1 cup all-purpose flour
• 1/2 cup butter, softened