Question

a man gets employment of Rs 650 per month with annual incement Rs. 50.What does he earn in 15 years ?

Answer 1

initial salary is 650
per month difference is 50
number of months in 15 years is 15*12 i.e 180 months

so salary after 180th month is a+(n-1)d i.e 650+(180-1)50=9600rs