A company selects an employee at his 25th age and offers salary as Rs.40000 per
annum for first 2 years. Afterwards, every year he gets increment of Rs.4000 for
next 15 years and his salary become constant till his retirement. If Rs.80,000 is
his average salary (throughout his career) then at what age he retires?
Choose the correct choice from the following answers: A) 48 B) 49 C) 50 D) 52 E) 53
For 1st 2 yrs salary=40,000   After 2 years he get increment of 4000 every year for 15 years   So 15th year salary =44000+14*4000= 
<gadget id="calculator">44000+14*4000</gadget>
<output>100_000</output>
100000   Now by using arithmetic progression   S15=n/2(a+l)=15/2(44000+100000)=1080000   Now avg salary=80000   80000+10,80000+10,0000x/17+x=80000   By solving   x=10   now  27+15+10= 
<gadget id="calculator"> 27+15+10</gadget>
<output>52</output>
52   so 52 is the age   ANSWER:52
<result>D</result>
A company selects an employee at his 25th age and offers salary as Rs.40000 per
annum for first 2 years. Afterwards, every year he gets increment of Rs.4000 for
next 15 years and his salary become constant till his retirement. If Rs.80,000 is
his average salary (throughout his career) then at what age he retires?