There are 50 rabbits on a farm. they are increasing at the rate of 12% every month. how many months will it be until there are 1000 rabbits?

Given:
50 rabbits
12% increase per month.

Solve for the increase per month. (multiply 50 by 12%)
50 x 12%= n
50 X .12= 6
6 rabbits per month is increased.
We will solve for the total number of months it will be when the number of rabbits reached up to 1000.
1000-50 +6=n
n=1000-50
          6
n = 950 ÷ 6
n= 158.33 months or 158 months and 10 days.

Since there are 50 rabbits already in the farm, we will subtract 50 from 1000. Every month the rabbits increased 12 % which is 6 (12% of 50) so, we will divide 950 (1000-50=950) by 6. The result is 158.33... months or 158 months and 10 days or .33 month.
158 months x 6= 948 rabbits (950-948=2)
Since 6 rabbits are increased per month, we need to calculate the two rabbits to make up 950. 
2 rabbits ÷  6 rabbits per month =.33 or 33% of the total increased.
33% of 30 days (1 month) =9.9 days or 10 days when rounded off.