I have tried everything I can think of and can not figure this out to save my life. Please help me I am desperate.

An average Great Dane weighs between 120 and 150 pounds. Express the range of weight for a Great Dane in kilograms. Use the formula k=0.45p. I know the answer is 264.6 and 330.75kg but I just can't seem to figure out how to get there.