That math looks like you are calculating the expected value of a raffle ticket randomly awarded to one donor with a value of 2000$.
But instead, the 2000$ is awarded to the charity that received the most donations in one hour. So we just have to donate more times than the second most-donated-to charity.
Oh, I must have misread it. I thought it was essentially a raffle.
I mixed it up with this part:
$150 added to a random donation each hour, every hour for 24 hours.
Oh, I must have misread it. I thought it was essentially a raffle.
I mixed it up with this part: