8.a)(100-25=75)
500*.75=375mg-->Day 1
375*.75=281mg-->Day 2
281*.75=211mg-->Day 3
211*.75=158mg-->Day 4
158*.75=119mg-->Day 5
119*.75=89mg-->Day 6


8b) Day 1--> take 2 pills (375*2=750)
Day 2--> take half a pill (281/2=141)
Day 3--> take half a pill (281/2=141)
Day 4--> take half a pill (281/2=141)
Day 5--> take half a pill (281/2=141)
=(141*4) + 750
=1314mg

(By taking 4 pills in a period of 5 days)