You want to find the time <em>t</em> such that

Divide both sides by $200 :

Take the logarithm of both sides:

Divide both sides by 0.04 and solve for <em>t</em> :

Answer:

Step-by-step explanation:
Hope this helps you.
Answer:
Constant Proportionality: 144
~ I really hope this is correct, if not then, I'm sorry~
Step-by-step explanation: