Answer:
$210.5 or $842
Explanation:
for half 421*.50=$210.5 or for double 421*2=$842
So 421 is 50% of x amount. This means that 421 is half of x.
So to find x, we multiply 421 by 2, so we can find x.
421 * 2 = x.
842 = x.
Check:
50% of 842 is 421.
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