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S = a / (1-r)
84 = 48 / (1-r)
84 - 84r = 48
84 - 48 = 84 r
36 = 84 r
r = 36/84
r = 3/7
84 = 48/(1 - r)
84 - 84r = 48
-84r = -36
r = -36/-84 = 9/21= 3/7