Sums
Two sums. Each one uses only the numbers typed on this page. Nothing is sent, and nothing is stored.
A result is arithmetic. It is not a price, not a forecast, and not advice.
Amounts are in dollars. The Pounds switch at the top writes the same sums in pounds. Nothing is converted: the sum uses the number you type.
Information, not advice. A clean result does not make anything a good investment.
A fee and a spread
The fee is that percentage of the amount. The spread is that percentage of the same amount. The two are added, and taken off the amount. This is not how any particular exchange works out a price.
A fall
The fall is that percentage of the amount, taken off the amount. The boxes start at 1,000 and 60%. That pair is an example. It is not a forecast, and it is not a price.
60% of $1,000.00 is $600.00. $1,000.00 minus that is $400.00.