Randy earned $57,890.00 of taxable income last year. If the federal income tax rate was 23%, then how much federal income tax did Randy pay on his taxable income last year?
A.
$14,472.50
B.
$13,314.70
C.
$12,735.80

a

step-by-step explanation:

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ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source:  

if i knew id you bro,, my bad