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Persamaan untuk keterangan :
Dina = Rp24.000
Dani = 4 x Rp24.000
= Rp96.000
Lisa = 3xRp24.000 – Rp15.000
= Rp57.000
Lisa = 1⁄2 Sani + Rp20.000
1⁄2 uang Sani = Rp57.000 – Rp20.000
= Rp37.000
Uang Sani = 2 x Rp37.000
= Rp74.000
Paling banyak adalah Dani (96000)
Paling sedikit Dina (24 000)
Jumlah uang mereka 251 000