Anamika earns Rs 5 more in a week than the preceeding week.she earned Rs 125 in the first week. How much would she earn at the end of 39th week?
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This case is a form of AP,
125, 130, 135.......
where first term a = 125
and common difference d = 5
at the end of 1st week she earns = 125 = 1st term
at the end of 2nd week she earns = 130 = 2nd term
So,
at the end of 39th week, she earns = 39th term
nth term is given by
a(n) = a + (n-1)d
a(39) = 125 + (39-1)(5)
a(39) = 125 + (38)(5)
a(39) = 125 + 190
a(39) = 315
Therefore, she will earn Rs. 315 at the end of 39th week.
125, 130, 135.......
where first term a = 125
and common difference d = 5
at the end of 1st week she earns = 125 = 1st term
at the end of 2nd week she earns = 130 = 2nd term
So,
at the end of 39th week, she earns = 39th term
nth term is given by
a(n) = a + (n-1)d
a(39) = 125 + (39-1)(5)
a(39) = 125 + (38)(5)
a(39) = 125 + 190
a(39) = 315
Therefore, she will earn Rs. 315 at the end of 39th week.
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