Stephanie has paid three-quarters of her gas bill, which is 40 * 0.75 = $<<40*0.75=30>>30.
She then made another payment, which means she has paid 30 + 5 =$<<30+5=35>>35 of her gas bill.
She has paid half of her water bill, which is 40 * 0.5 = $<<40*0.5=20>>20.
She has made 4 payments towards her internet bill, which is a total of 4 * 5 = $<<4*5=20>>20.
Overall, her bills were 60 + 40 + 40 + 25 = $<<60+40+40+25=165>>165.
Overall, she has made payments of 60 + 35 + 20 + 20 = $<<60+35+20+20=135>>135.
Therefore, she still has to pay 165 – 135 = $<<165-135=30>>30.
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