A first order reaction takes 40 minutes for `30%` decomposition. Calculate its half life period.

Explanation

To solve the problem of calculating the half-life period of a first-order reaction that takes 40 minutes for 30% decomposition, we can follow these steps:

### Step 1: Understand the given data
We know that for a first-order reaction:
- Time taken for 30% decomposition (t) = 40 minutes
- Percentage decomposition (x) = 30%

### Step 2: Calculate the remaining concentration after 30% decomposition
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