Answer: 30%
Step-by-step explanation:
First, we will put completed over the total.

Now, we will divide.
0.3
Lastly, we will multiply by 100 to turn it into a percent.
0.3 * 100 = 30%
You have ridden 30% of the course.
its 1/6 i caculated it on google
500 represents the initial amount of medication, since when t=0, a=500.