Answer
9
Work Step by Step
Write the equation to model the problem.
36000/(n+3)=36000/n - 1000 (Find the positive value of n)
36000n=36000(n+3)-1000n(n+3)
$1000n^2+3000n-108000$
$n^2+3n-108=0$
(n-9)(n+12)=0
n = 9 (n=-12 is an extraneous solution as n should be positive)
