The price of grapes at the grocery store is $1.44 per pound. there are approximately 0.45 kilograms in a pound. to the nearest cent, what is the price of grapes in dollars per kilogram?

We want to convert the price from dollars per lb to dollars per kg.  We will want to use unit rates to make the conversion by setting up the multiplication to eliminate the units we don't want and leave the units we want... Let me demonstrate... we start with pounds and want to end with kilograms...

1.44  dollars/lb x 1 lb/0.45 kg =

by setting it up with the unit rate so that lb is in the numerator, it cancels with the lb in the denominator from the price.  The units we are left with are dollars/kg

So finishing the math...

1.44 dollars/lb x 1lb/.45 kg = 1.44 dollars/.45 kg = $3.20 /kg