Jade spends $1600 x 75/100 = $<<1600*75/100=1200>>1200 for living expenses.
She spends $1600 x 1/5 = $<<1600*1/5=320>>320 for insurance.
She spends a total of $1200 + $320 = $<<1200+320=1520>>1520 for living expenses and insurance.
So, she saves $1600 - $1520 = $<<1600-1520=80>>80 per month.
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