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it is d
its easy
T half is the time needed for plasma concentration of drug to decrease by half
and her plasma conc of the drug was 240 at 1 pm and reach half at5 pm
so t half = 4 hours
after 1st t half 120
after 2nd thalf 60
after 3rd thalf 30
after 4th thalf 15
after 5th thalf 7.5
so it decrease below 10 ng after 5 thalf
so after 20 hours
so it is d for sure
its easy
T half is the time needed for plasma concentration of drug to decrease by half
and her plasma conc of the drug was 240 at 1 pm and reach half at5 pm
so t half = 4 hours
after 1st t half 120
after 2nd thalf 60
after 3rd thalf 30
after 4th thalf 15
after 5th thalf 7.5
so it decrease below 10 ng after 5 thalf
so after 20 hours
so it is d for sure
