Chelsea made 4 batches of cupcakes for the bake sale. The cupcakes took 20 minutes to bake and 30 minutes to ice per batch. How long did it take Chelsea to make the cupcakes? Let's think first. Chain of thought:
Chelsea baked 4 batches of cupcakes x 20 minutes each = 80 minutes of baking. She iced 4 batches of cupcakes x 30 minutes each = 120 minutes. It took Chelsea 80 + 120 = 200 minutes to make the cupcakes for the bake sale.
Therefore, the answer is 200.