During a phonecall of yours, one of your Bluetooth headphone starts to run out of battery. When you plug it in to its charger, it only has 10 percent of battery left. At the same time, the other headphone has still 25 percent remaining.
You carry on with your phonecall, and eventually the other headphone starts to run out of juice as well. You switch headphones, and the fresh one has 80 percent of its charge left.
Find the reduced proportion of charged percentage points to those spent during an active phonecall.
