Question

The population of a town is 63400. It increases by 15% in the first year and decreases by 20% in the second year. what is the population of the town at the end of 2 year?

• A. 56300
• B. 57300
• C. 58300
• D. 58328

Answer 1

Answer:

D. 58328

Increases 15% in the first year and decreases 20% in the second year,



{63400 × (115/100) × (80/100)}



⇒ 58328
Alternate method

net % effect formula, X = 15%, and Y = - 20%

=[X + Y + {(XY)/100}%] =[(+15 - 20) - {15 × 20}/100]



⇒ - 5 - 3



⇒ - 8

So  (100 - 8)% of 63400



⇒ 92% of 63400



⇒ 58328