Question

The average monthly salary of 20 employees in an organization is Rs. 1500. If the manager's salary is added then the average salary increases by Rs. 100.. What is the manager's monthly salary?

• A. Rs. $2000$
• B. Rs. $2400$
• C. Rs. $3600$
• D. Rs. $4800$

Answer 1

The correct option is C Rs. $3600$

Given that, average salary of $20$ employees is Rs. $1500$

Therefore, $1500=\frac{\text{sum of 20 employees salary}}{20}$

$⟹\text{sum of 20 employees salary}=1500\times 20=30000$ ------(1)

Given that if the manager salary is added, the average increases by $100$

Therefore, $1500+100=\frac{\text{sum of 20 employees salary + manager salary}}{20+1}$

$⟹1600=\frac{30000+\text{manager salary}}{21}$ (from (1))

$⟹30000+\text{manager salary}=33600$

$⟹\text{manager salary}=33600-30000=3600$

Therefore, the salary of the manager is Rs. $3600$