How to calculate value of a percent of a range

Question

Hi I have a range and percent of that range. I want to calculate the value of that percentage.

for exam:

min = -5
max = 30
percentage = 8%

value = ?

Value should be a 8% of the range of (-5 .. 30)

Answer 1

Since$$ \text{percentage} = \frac{\text{value} - \min}{\max - \min} \times 100\%, $$ then$$ \text{value} = \min + (\max - \min) \times \text{percentage}. $$

Answer 2

Find $8\%$ of $30-(-5)$. That is $$\frac{8}{100}\times 35=m.$$ Then what you want is $-5+m$.