The average salary of 20 workers in an office is Rs.1900 per month. If the manager's salary is added, the average salary becomes Rs.2000 p.m. What is the manager's annual salary?  Choose the most appropriate option
A) Rs.24,000 B) Rs.25,200 C) Rs.45,600 D) None of these E) Cannot be determined
Explanation:   Manager's salary per month   = (Rs.21×2000−20×1900)) = Rs.4000   Manager's Annual salary = Rs.(4000×12)=Rs.48000   Correct Option:None of these
<result>D</result>
The average salary of 20 workers in an office is Rs.1900 per month. If the manager's salary is added, the average salary becomes Rs.2000 p.m. What is the manager's annual salary?