The pollution in a normal atmosphere is less than `0.01%`. Due to leakage of a gas from a factory, the pollution is increased to 20%. If every day 80% of pollution is neutralised, in how many days the atmosphere will be normal?

Explanation

To solve the problem step by step, we will analyze the pollution levels and how they change over time due to the neutralization process.

### Step 1: Understand the Initial Conditions
The initial pollution level is given as 20%.

### Step 2: Determine the Daily Neutralization
Each day, 80% of the pollution is neutralized. This means that only 20% of the pollution remains at the end of each day.

...