Question 924218
{{{S = a/(1-r)}}}



{{{S = 27/(1 - (-4/5))}}}



{{{S = 27/(1 + 4/5)}}}



{{{S = 27/(5/5 + 4/5)}}}



{{{S = 27/(9/5)}}}



{{{S = 27*(5/9)}}}



{{{S = 15}}}



The sum is 15.

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