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C1 = 1900000
Y2 = 2500000
C2 = 2350000
Fungsi konsumsi:
(C - C1)/(C2 - C1) = (Y - Y1)/(Y2 - Y1)
(C - 1900000)/(2350000 - 1900000) = (Y - 2000000)/(2500000 - 2000000)
(C - 1900000)/450000 = (Y - 2000000)/500000 (kali 50000 kedua ruas)
(C - 1900000)/9 = (Y - 2000000)/10
C - 1900000 = 0,9Y - 1800000
C = -1800000 + 0,9Y + 1900000
C = 100000 + 0,9Y
Mungkin pada soal fungsi konsumsi dalam ribuan rupiah, maka fungsinya menjadi
C = 100 + 0,9Y
Jawaban: B