I've already figured half of this problem out but can not finish the second part

Mathematics
Tutor: None Selected Time limit: 1 Day

A drug is eliminated from the body through urine. Suppose that for an initial dose of 50 milligrams, the amount A(t) in the body t hours later is given by A(t) = 50(0.8)t.
(a) Estimate the amount of the drug in the body 7 hours after the initial dose. (Round your answer to two decimal places.)
  mg

(b) What percentage of the drug still in the body is eliminated each hour?

Apr 9th, 2015

Twenty percent is eliminated each hour, since only 80% of the previous hours drug remains each successive hour. Here is the proof:

 Hour1
2
3
4
5
6
7
Drug in Body
40
32
25.60
20.48
16.38
13.11
10.49
Drug Eliminated
 8
6.40
5.12
4.10
3.28
2.62
Percentage Eliminated From Previous Hour

20%
20%
20%
20%
20%
20%


Apr 9th, 2015

Thank you very much!!!

Apr 9th, 2015

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Apr 9th, 2015
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Apr 9th, 2015
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