You enter the level of ETH you desire and it will work out how much it would cost. Alternatively you can enter the level of fiat you want to invest. The platform will determine how much ETH you will get. Learn much more about the denomination of Ethereum models. https://financefeeds.com/analysts-predict-cardano-price-crash-to-below-0-40-holders-scramble-to-new-xrp-rival-for-safe-haven/