Answer:

Step-by-step explanation:
Dividing 20 by 100 gives us 1%. so 0.2 × 3 = 0.6 so it take 3 0.2s to get to 0.6. meaning 0.6 is 3% of 20.
Answer:

Step-by-step explanation:
From law of indices
Step-by-step explanation:

<h2>-20 is the right answer.</h2>