That's not grammatical in English. You need to say "a thousand", not just "thousand".
4 pounds of 500 grams is a kilogram. But American pound is different to metric pound
One pound is 453 g, which means that a kilogram is 2.2 pound, not 4.
Also, I don't think that a metric pound is a thing.
It said kilos, not pounds. Each kilogram is 2.2 pounds. I think you can do the rest of the math. ;)