Question 397747
<pre><font size = 3 color = "indigo"><b>
Hi,
Question Sets Up a sequence {10,15,20,25,30,35,40...)of the savings amount
as months progress.
{{{a[n]=a[1]+(n-1)*d}}}
{{{S[n]=(n/2)(2*a[1]+ (n-1)d)}}}
{{{S[6]=(3)(20+ 25)}}} = $135  
{{{S[7]=(3.5)(20+ 30)}}} = $175 
will take 7 months to at have at least $150