Questions: A species of animal decreased from 2950 in 1998 to 2280 last year. What is the percentage change?

Solution Steps

To find the percentage change, we need to calculate the difference between the initial and final values, divide this difference by the initial value, and then multiply by 100 to convert it to a percentage.

The change in population from 1998 to last year is given by: \[ \text{Change} = \text{Final Population} - \text{Initial Population} = 2280 - 2950 = -670 \]

The percentage change is calculated using the formula: \[ \text{Percentage Change} = \left( \frac{\text{Change}}{\text{Initial Population}} \right) \times 100 \] Substituting the values: \[ \text{Percentage Change} = \left( \frac{-670}{2950} \right) \times 100 \approx -22.7119 \]

Final Answer