ram save Rs5 in the first week of a year and then increase his weekly saving by Rs 1.75 .if in the nth week his weekly saving become Rs 20.75 , find n
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Answer:
Given that
a=5
d=1.75
a
n
=20.75
a
n
=a+(n−1)d
20.75=5+(n−1)1.75
15.75=(n−1)1.75
(n−1)=
1.75
15.75
=
175
1575
=
7
63
=9
∴n−1=9
∴n=10
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