2014-05-14T01:47:05-04:00
The original bill was valued at 106.67 \$

if 25% was paid, and 80 dollars are left, this means that 80 dollars is 75% of the bill. 25% is a quater, and 75% is three quarters.

here, we can divide 80 into three parts ->

80 ÷ 3 ≈ 26.67
that means a quater of the bill is 26.67 \$

if 80\$ were left to be paid, just add the 26.67\$ from the first quater ->

80 + 26.67 = 106.67 \$
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