Finding the derivative of LN How to find the derivative P = 30-5ln [(x / 100) + 1]

Finding the derivative of LN How to find the derivative P = 30-5ln [(x / 100) + 1]

p=30-5ln[(x/100)+1]
p'=-{5/[(x/100)+1]}*[(x/100)+1]'
=-[500/(x+100)]*(x/100)'
=-[500/(x+100)]*(1/100)
=-5/(x+100).