Mary currently has 36 cherry + 48 berry cupcakes = <<36+48=84>>84 cupcakes.
Mary needs an additional 144 cupcakes – 84 = <<144-84=60>>60 cupcakes.
Mary wants to split that number evenly between chocolate and vanilla, so 60 / 2 = <<60/2=30>>30 cupcakes of each flavor.
#### 30