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
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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]
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