A student saves is ₹5 in each week.what is the
the total amount of his savings after
15 weeks???
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A student saves is ₹5 in each week.what is the
the total amount of his savings after
15 weeks???
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Answer:
Saving made in first week=5
Saving made in second week=5+1.75=6.75
Saving made in third week=6.76+1.75=8.50
So, the series is 5,7.75,8.50,...
Since difference is same, it is an A.P
Common difference=d=1.5
Given:In n
th
week, her savings become Rs.20.75
So, a
n
=20.75
Also,a=5,d=1.75
Using a
n
=a+
left(n−1
right)d
Rightarrow20.75=5+
left(n−1
right)
times1.75
Rightarrow15.75=
left(n−1
right)
times1.75
Rightarrown−1=
dfrac15.751.75=9
Rightarrown−1=9
thereforen=10
Hence, in 10
th
week, her weekly savings become Rs.20.75
Answer:
75 rupees saves by a student