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a = 25.000
b = 5000
S = (n/2)(2a+(n-1)b)
4.050.000 = (n/2)(50.000+5000n-5000)
4.050 = (n/2)(45+5n)
8.100 = 45n+5n²
n²+9n-1620 = 0
(n+45)(n-36) = 0
n = -45 atau n = 36; ambil yang positif aja
n = 36 minggu