Question

present poulation of a town is 40,000.The population decrease for every year 50% , then population after 3 years is​

Answer 1

Answer:

its answer is 5000

if population is decreasing by 50% in 3years having total popn 40000

Answer 2

Answer:

5000

Step-by-step explanation:

equivalent rate of decrease for 2 yrs

= 50+50 - (50×50)/100 = 75%

for 3 yrs,

75 + 50 - (75×50)/100 = 87.5%

population after 3 yrs

= 40000 - 87.5% of 40000

= 40000 - 35000 = 5000

2nd Method,

population after 3 yrs

= p( 1 - r/100)^t

= 40000( 1 - 50/100)^3

= 40,000 × 1/2 × 1/2×1/2 = 5000