Question

a man saves rupees 20 in the first month ₹30 in the second month rupees 40 in the third month and so on find the total amount saved in 5 years​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:18900

Step-by-step explanation:

the savings every month is series with 1st term 20 , differnce 10 and nth term (n+1)*10 .

in 5 years 60 months so upto 60 th term

20+30+40+..........+ (60+1)*10

sum up to nth term in series = 60/2[2*20+(60-1)10]