(800) × ( 3 × 10^-1)
= 8 × 10 ^2 × 3 × 10^-1
= 24 × 10^(2 - 1)
= 24 × 10^1
= 2.4 × 10^2
#$# HOPE YOU UNDERSTAND #$#
#$¥ THANK YOU ¥$#
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