You need to divide the price per pound by the price per kilogram.
(Price per pound)/(Price per kilogram) = Kilograms per pound
Alternatively, I could just tell you that 1 pound = 0.45359237 kilograms
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1 pound = 0.45359237 kilograms
To convert dollars per pound to dollars per kilogram, you need to know that 1 pound is approximately 0.453592 kilograms. So, to convert, you would divide the price per pound by 0.453592 to get the price per kilogram. For example, if something costs $5 per pound, you would divide $5 by 0.453592 to get approximately $11.02 per kilogram.
$10.96 per kilogram it the same as $4.98 per pound.
Use the fact that 1 pound = 0.45359237 kilograms. Multiply the number of pounds by the number of kilograms per pound: 90 * 0.45359 = 40.8233 kg.
Multiply by density