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2015-05-12T19:24:56+08:00

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This is an Arithmetic sequence.

An arithmetic sequence is shown as:
a_1,a_2,a_3,...,a_n
and 
a_2-a_1=a_3-a_2=...=a_n-a_{n-1}=d

We don't know a_n which  is the last term and it is computed by:
a_n=a_1+d(n-1) 

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.

a_{31}=3.00+0.25(31-1)=3.00+0.25(30)=3.00+7.50=10.50

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