Question

(i) The population of a town in the year 1990 was 15600.
The population is now 11 420.
Calculate the percentage decrease in the population.

Answer 1

the population of a town = 15600 at 1990 and then it decrease at 11420

total decrease population = 4180

and decrease present = 4180/15600×100

= 26.79%

I hope this ans is helpful for you

Answer 2

➤ Given :-

Total population at 1990 :- 15600

Population after change :- 11420

➤ To Find :-

Percentage of decreased population

➤ Formula required :-

${\large \tt \dashrightarrow \orange{\boxed{\tt \gray{\dfrac{Obtained \: value}{Total \: value} \times 100}}}}$

➤ Solution :-

First, we should find the value of population decreased by subtracting the total population and population after change

Decreased population :-

${\tt \longrightarrow 15600 - 11420}$

${\tt \longrightarrow 4180 \: \: people}$

Now,

Percentage of decreased population :-

${\tt \longrightarrow \dfrac{4180}{15600} \times 100}$

${\tt \longrightarrow \dfrac{4180}{\cancel{15600}} \times \cancel{100} = \dfrac{4180}{156}}$

${\tt \longrightarrow \cancel \dfrac{4180}{156} = \boxed{\tt 26.7 \bf\%}}$

$\Huge\therefore$ The percentage of the decreased population is 26.7%.

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More to know :-

• Percentage is written by the symbol of %.
• Percentage is used all over the world for many purposes. It is mostly used in calculating the marks of the students in schools and collages. The percentage can also be converted to fraction, decimal and ratio formats.
• To convert fraction to percentage, we should multiply the given fraction with 100.
• To convert decimal to percentage, first we should convert it to fractional form and then multiply by 100.
• To convert the ratio to percentage, first we should convert it to fraction and then we should multiply it by 100.