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4.Average
medium
The average salary of $20$ workers in an office is $Rs.\, 1900$ per $month.$ If the manager's salary is added, the average becomes $Rs.\,2000$ per $month.$ The manager's annual salary (in $Rs.$) is
Solution
Total monthly salary of $21$ persons
$=Rs.\,(21 \times 2000)=Rs.\, 42000$
Total monthly salary of $20$ persons $=Rs.\,(20 \times 1900)=Rs.\, 38000$
Monthly salary of the manager $=Rs.\, 4000$
$\therefore \quad$ Anmual salary of the manager $=Rs.\, 48000$
Std 13
Quantitative Aptitude
