Question

the rate at which the monthly salary of a person increase annually is an a.p. if he was drawing ₹ 4500 p.m.in his 11th year of service and ₹6900 p.m. in his 27th year of service , find his salary at the start and the annual increment.also find the monthly salary after 30 years​

Answer 1

We know to find any term we use

Tn=a+(n-1)d

So,here we have two equations

4500=a+(11-1)d

6900=a+(21-1)d

By solving,we get d=240 that is annual increement

and putting this value in any above equations we get

a=2100 that is starting salary

Tn=2100+(30-1)240

We get tn=9060 that is your answer