As New Year’s resolution Ritika planned to save from her pocket money everyday. Starting from 5th January, she decided to save the amount equal to the date of the month. On 30th January, she decided to get a gift for their maid’s daughter for Rs.50 and a birthday present worth Rs.100, for her grandfather. What is the amount left with her at the end of the month? What value is reflected by Ritika’s gesture?
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It maks an Ap of
5,6,7,8....3
So
a=5. d=1. n=30
Sn=n/2{2a+(n-1)d
Sn=30/2{5×2+(30-1)1}
Sn=15{10+29}
Sn=15×39
Sn₹585
She spend₹ 150₹ 50 for daughter&₹100 for grandfather
Amount remain=585-150=₹436
5,6,7,8....3
So
a=5. d=1. n=30
Sn=n/2{2a+(n-1)d
Sn=30/2{5×2+(30-1)1}
Sn=15{10+29}
Sn=15×39
Sn₹585
She spend₹ 150₹ 50 for daughter&₹100 for grandfather
Amount remain=585-150=₹436
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