How much is $100 US in EC?

Could you please clarify what you mean by "EC"? There are multiple cryptocurrencies and tokens that could potentially be abbreviated as "EC," and the exchange rate for US dollars to any given cryptocurrency can vary significantly depending on market conditions and the specific cryptocurrency involved. If you are referring to a specific cryptocurrency or token, I would need more information to provide an accurate answer. Additionally, it's worth noting that cryptocurrency prices are highly volatile and can change rapidly, so the exchange rate for $100 USD to EC may be different by the time you read this response.