Sure, but that was not the claim by the parent. It's a bit unintuitive the way the parent wrote the claim, but the parent said the currency lost its value by 250% which is not really possible. What I think the parent means is that it became 2,5 times less worth. That is, what before could buy 100 apples can now buy 40 apples since 100/1=100 and 100/2,5=40, and as you say it, that means the value is down by 60% - same thing. At least that is how I understand what the parent claimed.