Person X joins a job at 20 yrs. First 3 years salary = 10,000 p.a. Afterwards every year increment of 2,000 per year for 10 years. Then salary becomes constant till retirement. At retirement average salary is 25,000. (throughout career). At what age he retires? Choose the most appropriate option:	A) 50	B) 60	C) 40	D) 70	E) 80
Let age of retirement = x   so according to the given condition 25000*(x-20)   =10000*3+12000+14000+16000+18000+20000+22000+24000+26000+28000+30000+30000(x-33)   = 30000+210000+30000x-990000   = 30000x-750000   or 25000x-500000=30000x-750000   or 5000x = 250000   or x = 50   50NSWER:50
<result>A</result>
Person X joins a job at 20 yrs. First 3 years salary = 10,000 p.a. Afterwards every year increment of 2,000 per year for 10 years. Then salary becomes constant till retirement. At retirement average salary is 25,000. (throughout career). At what age he retires?