The average income of the top 1 percent is approximately 1.3M (
http://www.investopedia.com/news/how...ou-top-1-5-10/).
There are approximately 125M households (
https://www.statista.com/statistics/...lds-in-the-us/).
Yes, they're lousy cites. But for a rough estimate, I'm not wasting too much time on this. So approximately 1.25M households making approximately $1.3M.
Approximately 42% of workers make below $15/hour (
http://fortune.com/2015/04/13/who-makes-15-per-hour/). There are 153,000,000 employed Americans (
http://www.dlt.ri.gov/lmi/laus/us/usadj.htm).
So there are approximately 64M people making below $15/hour. Here's where there's data that I'm missing, but let's say they average about $11/hour (halfway between minimum wage and $15/hr). So we need to find an extra $4/hour. That's $4 * 40 * 50 (two weeks vacation) = $8,000.
There are 51.2 people making less than $15/hr for every one household in the 1%. So each household would need to pay 409,600, or about about 31.5% of their taxable income.
So I think it's reasonable to say the real number is probably between 25 and 35 percent.
But, I just wasted a lot of time Googling and doing math for an utterly pointless question. Why? We aren't going to tax them to provide $15/hr. Their taxable income is not the same as profits for employers, which are divided in a bunch of ways between re-investment, corporate taxes, shareholder profits, take home pay for executives/owners/1%ers, etc. Beyond that, the increase in pay for the workers means more disposable income which then gets pumped back into businesses and stimulates the economy, so they wouldn't lose the full amount they had to pay out and some would likely see net gains.