Answer
$7.7 \times 10^{10}$
Work Step by Step
To avoid rounding errors in multistep calculations, round only the final answer— do not round intermediate steps. If you write down intermediate answers, keep track of significant figures by underlining the least significant digit. In multiplication or division, and in addition or subtraction, the result carries the same number of decimal places as the factor/quantity with the fewest decimal places. Finally, the answer should be rounded to appropriate number of significant figures.
