Find the average increase rate, if increase in the population in the first year is 30% and that in the second year is 40%.
A. 41%
B. 56%
C. 40%
D. 38%
E. 39%
Answer: Option A
Solution(By Examveda Team)
Let 100 be the original population.1st year's population increased = 30%
So, Population after first year
= (100 + 30% of 100)
= 130
Population in second year increases by 40%,
Then Population
= (130 + 40% of 130)
= 182
The final population become 182 which was originally at 100.
It means there is 82% increment in the population in 2 years
So, Average increment = $$\frac{{82}}{2}$$ = 41%
Mind Calculation Method:
Increase in population is given by,
100 == 30% $$ \uparrow $$ ⇒ 130 == 40% $$ \uparrow $$ ⇒ 182
Hence, average increase = $$\frac{{82}}{2}$$ = 41%
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Comments ( 1 )
Related Questions on Average
A. 125 km/hr
B. 75 km/hr
C. 135 km/hr
D. 120 km/hr
Successive increase = 30+40+30*40/100
=70+12
=82
Average increase =82/2
=41%