Average monthly salary of 20 employees in an organisation is Rs., 1500 . If manager's salary is

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The average monthly salary of $20$ employees in an organisation is $Rs.\, 1500$. If the manager's salary is added, then the average salary increases by $Rs.\,100.$ What is the manager's monthly (in $Rs.$)

A

$2000$

B

$2400$

C

$3600$

D

$4800$

Solution

Average monthly salary of $20$ employees $=Rs.\, 1,500$

On adding manager's salary (let it be $x$ )

New average $=\frac{1500 \times 20+x}{21}=1500+100=1600$

$1500 \times 20+x=21 \times 1600$

$x=21 \times 1600-20 \times 1500$

$=33600-30000=Rs.\,3600$

Standard 13

Quantitative Aptitude

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