Verified answer

Answer:

To find the percentage increase or decrease, you can use the formula:

\[

\text{Percentage Change} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100

\]

In this case:

\[

\text{Old Value} = 830 \, \text{cm}

\]

\[

\text{New Value} = 249 \, \text{cm}

\]

Substitute these values into the formula:

\[

\text{Percentage Change} = \left( \frac{249 - 830}{830} \right) \times 100

\]

Now, calculate the percentage change:

\[

\text{Percentage Change} = \left( \frac{-581}{830} \right) \times 100 \approx -70.12\%

\]

Therefore, there is a decrease of approximately \(70.12\%\) from \(830 \, \text{cm}\) to \(249 \, \text{cm}\).

Answer:

70.12%

Step-by-step explanation:

To find the increase or decrease in percentage, we can use the following formula:

Percentage Change = ((New Value - Old Value) / Old Value) * 100

In this case, the old value is 830 cm and the new value is 249 cm. Let's calculate the percentage change:

Percentage Change = ((249 - 830) / 830) * 100

Percentage Change = (-581 / 830) * 100

Percentage Change ≈ -70.12%

So, there is a decrease of approximately 70.12% from 830 cm to 249 cm.