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Answer:
 $16.345 / kg
Step-by-step explanation:
You know there are 1000 grams in 1 kilogram. (The prefix kilo- means 1000.) So 550 grams is 550/1000 kg = 0.55 kg.
The price per kilogram is found by dividing the price by the corresponding number of kilograms:
 unit price = $8.99 / (0.55 kg) = $16.3454545... (2-digit repeat) / kg
Rounded to 3 decimal digits, the unit rate is ...
 unit rate = $16.345 / kg
