(D) Initial population $P = 5000$.In the $1^{st}$ year,the population increases by $10 \%$.$P_1 = 5000 + (10/100) \times 5000 = 5000 + 500 = 5500$.In

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(D) Initial population $P = 5000$.In the $1^{st}$ year,the population increases by $10 \%$.$P_1 = 5000 + (10/100) \times 5000 = 5000 + 500 = 5500$.In the $2^{nd}$ year,the population decreases by $20 \%$.$P_2 = 5500 - (20/100) \times 5500 = 5500 - 1100 = 4400$.In the $3^{rd}$ year,the population increases by $30 \%$.$P_3 = 4400 + (30/100) \times 4400 = 4400 + 1320 = 5720$.Thus,the population at the end of $3$ years is $5720$.

Competitive Quantitative Aptitude Interest Simple Interest

Difficult

The population of a particular area of a city is $5000$. It increases by $10 \%$ in $1^{st} \,yr$. It decreases by $20 \%$ in the $2^{nd} \,yr$ because of some reason. In the $3^{rd} \,yr$ the population increases by $30 \%$. What will be the population of the area at the end of $3$ $years$?

A
$5120$
B
$5300$
C
$5400$
D
$5720$

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Interest

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Simple Interest

The sum of money that will produce ₹ $1770$ interest in $7 \frac{1}{2}$ years at $8 \%$ simple interest per annum is:

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What annual instalment (in $Rs.$) will discharge a debt of $Rs. 1092$ due in $3$ years at $12 \%$ simple interest?

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$A$ certain sum becomes $5$ times in $3$ years at simple interest. In how many years will it become $13$ times?

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An investor invested his savings in the stock market. The value of his investments increased by $12 \%$ and $9 \%$ in the first year and the second year respectively. If the value of his investments after two years became ₹ $97,664$,then how much had he invested (in ₹)?

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The cost price of a car is $Rs. 400000$. If its price decreases by $10\%$ every year,then what will be the cost (in $Rs.$) of the car after $3$ years?

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The population of a particular area of a city is $5000$. It increases by $10 \%$ in $1^{st} \,yr$. It decreases by $20 \%$ in the $2^{nd} \,yr$ because of some reason. In the $3^{rd} \,yr$ the population increases by $30 \%$. What will be the population of the area at the end of $3$ $years$?

Similar Questions

The sum of money that will produce ₹ $1770$ interest in $7 \frac{1}{2}$ years at $8 \%$ simple interest per annum is:

What annual instalment (in $Rs.$) will discharge a debt of $Rs. 1092$ due in $3$ years at $12 \%$ simple interest?

$A$ certain sum becomes $5$ times in $3$ years at simple interest. In how many years will it become $13$ times?

An investor invested his savings in the stock market. The value of his investments increased by $12 \%$ and $9 \%$ in the first year and the second year respectively. If the value of his investments after two years became ₹ $97,664$,then how much had he invested (in ₹)?

The cost price of a car is $Rs. 400000$. If its price decreases by $10\%$ every year,then what will be the cost (in $Rs.$) of the car after $3$ years?

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