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uang yang dimiliki bu Lusi pada mula² adalah y
y-2/5y = 3/5y
3/5y-20%y= 30.000
3/5y-1/5y = 30.000
2/5y = 30.000
y = 75.000
uang yang dipakai belanja = 2/5y = 2/5 x 75.000 = 30.000
maaf jika salah, semoga membantu