Final answer:
To find the February amount, multiply the January amount by the percentage change, then add the change to the January amount.
Step-by-step explanation:
To find the February amount, we need to calculate the 0.2% change from January. First, we convert 0.2% to a decimal by dividing by 100, giving us 0.002. Then, we multiply 0.002 by the January amount of 12.43 billion dollars.
This gives us 0.02486 billion dollars, or 24.86 million dollars. To find the February amount, we add the change to the January amount:
February amount = January amount + Change = 12.43 billion dollars + 24.86 million dollars = 12.45486 billion dollars.