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Loyalty discount! If the total amount of your purchases from the seller more than:

$1 the discount is 1%
$5 the discount is 2%
$10 the discount is 3%
$20 the discount is 5%
$50 the discount is 7%
$100 the discount is 10%
$200 the discount is 15%
$0.09
650. Of every million atoms of a radioactive isotope, 200 atoms decay every second. Determine the half-life of the T1 / 2 isotope.
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