Question 737094
Phil got a shot of penicillin that contained 500mg.  The penicillin decayed at a rate of 40%.  How much penicillin is left after 4 hours? Write the equation.
----------------
40% per what?  minute? hour? week?
-------------
If it's 40% per hour 60% remains.
{{{Remaining = 500*0.6^4}}}
= 64.8 mg