To find the percentage decrease in output for each product between 1913 and 1921, we'll follow these steps:
1. Find the initial and final values for each product in the years 1913 and 1921.
2. Calculate the actual decrease in output by subtracting the 1921 value from the 1913 value.
3. Calculate the percentage decrease by dividing the actual decrease by the 1913 value and then multiplying by 100.
Let's break this down for each product:
### Coal
1. Initial value (1913): 29.0 million tons
2. Final value (1921): 9.0 million tons
Step-by-step calculation:
- Actual decrease: [tex]\(29.0 - 9.0 = 20.0\)[/tex] million tons
- Percentage decrease: [tex]\(\left(\frac{20.0}{29.0}\right) \times 100 \approx 68.97\%\)[/tex]
### Grain
1. Initial value (1913): 80.0 million tons
2. Final value (1921): 37.6 million tons
Step-by-step calculation:
- Actual decrease: [tex]\(80.0 - 37.6 = 42.4\)[/tex] million tons
- Percentage decrease: [tex]\(\left(\frac{42.4}{80.0}\right) \times 100 = 53.0\%\)[/tex]
### Iron and Steel
1. Initial value (1913): 8.5 million tons
2. Final value (1921): 0.3 million tons
Step-by-step calculation:
- Actual decrease: [tex]\(8.5 - 0.3 = 8.2\)[/tex] million tons
- Percentage decrease: [tex]\(\left(\frac{8.2}{8.5}\right) \times 100 \approx 96.47\%\)[/tex]
### Conclusion
So, the percentage decreases in output for the products between 1913 and 1921 are as follows:
- Coal: 68.97%
- Grain: 53.0%
- Iron and Steel: 96.47%
The chart shows that the output for all three products decreased between 1913 and 1921.
