Question 1029856
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I am needing the formula to solve my problem. Starting day one, you have $10,000. Each day $1000 is added..10,11,12,13 and so on, 
until day 365. What is the total amount accumulated from day 1 to dat 365? 
Thank you
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Arithmetic progression with the first term 10000 and the common difference 1000.


You are asked about its 365-th term. It is


10000 + (365-1)*10000 = 10000 + 364*1000.


You can learn on arithmetic progressions from the lesson <A HREF=https://www.algebra.com/algebra/homework/Sequences-and-series/Arithmetic-progressions.lesson>Arithmetic progressions</A> in this site.


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<U>Question</U>: when the first $1000 came? On the day 1 (one) or on the day 2 (two)? It is not clear from the condition.


My solution assumes that the first $1000 came on the day 2.


The other tutor assumed it came on the day 1.


This uncertainty goes from your condition.