Question

If a person invest rupees 5 in the first month and increase this monthly investment by rupees to every succeed in month what will be the total investment at the end of 5 years

Answer 1

money invest in first month =Rs 5

every month investment increase by 1 rupee

to find : total money saved in 5 years

solution:

1 year=12 months

5 years = 5 *12 = 60 months

a=5

d=1

n=60

Sn=n/2[2a+(n-1)d]

S60=60/2[2*5+(60-1)1]

S60=30[10+59]

S60=30*69

S60=2070

The total invested in five years is Rs. 2070