At the farm, the chicken population increased by 20% in the second month and then by a further 15% in the next 7 months. If there were 276 chickens in the end, how many chickens were there at the farm at first?
|
Chickens |
Before |
100% |
Change 1 |
+ 20% |
After 1 |
120% |
Change 2 |
+ 18% |
After 2 |
138% |
Population of chickens at first = 100%
New population of chickens after first increase
= 100% + 20%
= 120%
Percentage of second increase
= 15% x 120%
=
15100 x 120%
= 18%
New population of chickens after second increase
= 120% + 18%
= 138%
138% of chicken population = 276
1% of the chicken population
= 276 ÷ 138
= 2
100% of chicken population
= 100 x 2
= 200
Number of chickens at first = 200
Answer(s): 200