According to a certain newspaper, in a recent recession, outstanding consumer credit in a certain country fell to $4,570,000,000,000—the seventh straight monthly decline. Most of the drop came as a result of consumers paying down revolving debt such as credit cards. (a)Write this number in word form.
four hundred fifty-seven trillion dollars
four trillion, five hundred seventy billion dollars
four hundred fifty-seven billion dollars
forty-five trillion, seven hundred billion dollars
four billion, five hundred seventy million dollars

(b)
Round this number to the nearest hundred billion.