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Verified answer
A = 250r = 4/5
S∞ = 2(a / (1-r)) - a
= 2(250 / (1-4/5)) - 250
= 2(250 / (1/5)) - 250
= 2(250 × 5) - 250
= 2(1250) - 250
= 2500 - 250
= 2250