Final answer:
The percentage decline of the Japanese stock market bubble from 47,300 to 20,000 is approximately -57.77%.
Step-by-step explanation:
To find the percentage decline, we need to subtract the final value from the initial value, divide that by the initial value, and multiply by 100. In this case, the initial value is 47,300 and the final value is 20,000.
Percentage decline = ((20,000 - 47,300) / 47,300) * 100
= (-27,300 / 47,300) * 100
≈ -57.77%