<PRE><B>Question 1128588</B>
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 population of 5.6 × 10^7 in 1990. Since then, the original population has doubled, and an additional 7.7 × 10^8 people have immigrated into the country. 
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(2)(5.6 x 10^7)


and then


(2)(5.6 x 10^7)+(7.7 x 10^8)


11.2x10^7+7.7x10^8


1.12x10^8+7.7x10^8


8.82x10^8
Only allow two-significant figures:


8.8x10^8</PRE>