Answer
$5*10^{-2}$
Work Step by Step
$.0000035*4000/.28$
$.0035*4/.28$
$.0035*4*100/.28*100$
$.0035*4*100/28$
$.35*4/28$
$1.4/28$
$1.4*10/28*10$
$14/280$
$7/140$
$1/20$
$.05$
$5*.01$
$5*10^{-2}$
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