To find the percent of change in altitude when a weather balloon moves from 50 ft to 95 ft, you can use the formula for percent change:
\[ \text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \]
In this case:
- Old Value = 50 ft
- New Value = 95 ft
Now substitute the values into the formula:
\[ \text{Percent Change} = \frac{95 - 50}{50} \times 100 \]
Calculate the difference:
\[ 95 - 50 = 45 \]
Now plug this into the formula:
\[ \text{Percent Change} = \frac{45}{50} \times 100 \]
Next, divide 45 by 50:
\[ \frac{45}{50} = 0.9 \]
Now multiply by 100:
\[ 0.9 \times 100 = 90 \]
Therefore, the percent of change in altitude is 90%, and since the altitude increased from 50 ft to 95 ft, this is described as an increase.
So, the final answer is:
90% increase.