At the farm, the cow population increased by 20% in the second month and then by a further 15% in the next 10 months. If there were 1104 cows in the end, how many cows were there at the farm at first?
|
Cows |
Before |
100% |
Change 1 |
+ 20% |
After 1 |
120% |
Change 2 |
+ 18% |
After 2 |
138% |
Population of cows at first = 100%
New population of cows after first increase
= 100% + 20%
= 120%
Percentage of second increase
= 15% x 120%
=
15100 x 120%
= 18%
New population of cows after second increase
= 120% + 18%
= 138%
138% of cow population = 1104
1% of the cow population
= 1104 ÷ 138
= 8
100% of cow population
= 100 x 8
= 800
Number of cows at first = 800
Answer(s): 800