The population of a district increases by during the first year and decreases by during the second year. If the present population of the district is , its population two years ago was:
- A
- B
- C
- D
Solution & Step-by-step Explanation
Let the population of the district two years ago be .
* After the first year's increase, the population becomes:
* After the second year's decrease, the population becomes:
We are given that this present population value equals :
* After the first year's increase, the population becomes:
* After the second year's decrease, the population becomes:
We are given that this present population value equals :