305 × 308 = ?(a) 94940(b) 93840(c) 93940(d) 94840
(c) 93940
$305 \times 308=(300+5) \times(300+8)$
$=(300)^{2}+300 \times(5+8)+5 \times 8$
$=90000+3900+40$
$=93940$
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