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This is an Arithmetic sequence.

An arithmetic sequence is shown as:

We don't know a_n which  is the last term and it is computed by:

Our a_1 is the amount Sally had on August 1 which is equal to 3.00
We compute for a_n which is also a_{31}. The common difference in the problem is 0.25.


Therefore she would have P10.50 by the end of August.
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