November 27, 2015, Forbes announced that Google's Chromecast attained a 35% market share in the

digital media streamer market, while Apple attained 20% market share. Because of this, executives at Apple

want to use comparative parity budgeting in an attempt to match Google's market share. By how much will

executives have to raise share of voice to achieve their desired market share growth?

Can you please explain any formula/all steps