Harish starting saving some money from first of 1 April 2020 he started rupees 20 on first day 25 on second day 30 on 3rd day and so on how much will he save till 30 june
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1st April to 30 June =91 days
It is a question of arithmetic progression
a1=20, d=5, n=91, put in the formula
S91=(91/2){2×20+(91-1)×5}
=(91/2){40+450)
=(91/2)(490)
=91×245=22295 Ans
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