the average monthly salary of 20 employees in an organisation is rs. 1400. if the manager ' s salary is added, then the average salary increases by rs. 100. what is the manager ' s monthly salary? Choose the correct choice from the following answers
A) 3600  B) 3890  C) 88798  D) 2789  E) 3500
<gadget id="calculator">1_400 + 100</gadget>
<output>1_500</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<gadget id="calculator">1_500 * 21</gadget>
<output>31_500</output>

<gadget id="calculator">1_400 * 20</gadget>
<output>28_000</output>

<gadget id="calculator">31_500 - 28_000</gadget>
<output>3_500</output>

<result>E</result>
the average monthly salary of 20 employees in an organisation is rs. 1400. if the manager ' s salary is added, then the average salary increases by rs. 100. what is the manager ' s monthly salary?
subtract(multiply(add(1400, 100), add(20, const_1)), multiply(1400, 20))
"explanation : manager ' s monthly salary rs . ( 1500 * 21 - 1400 * 20 ) = rs . 3500 . answer : e"