You need to use maths properties. In maths, there is a rule which states:
e∧㏑K=K
The equiation you need to simplify is e∧㏑0.2
Then, your solution is e∧㏑0.2=0.2
Apart from that, you can use your calculator. Find the e value in the calculator. Press it. Now, Look for the ln value. Press it. Now, write 0.2. The screen calculator will show eln0.2. That is equal 0.2.
