Final answer:
Joselyn should multiply 2.7 kg by 1000 to find out she has 2700 grams of salt water taffy.
Step-by-step explanation:
To convert the mass of salt water taffy from kilograms to grams, Joselyn would need to multiply the weight in kilograms by 1000. Since there are 1000 grams in a kilogram, the calculation would be:
2.7 kg × 1000 = 2700 grams of salt water taffy.