The charging standard for electricity consumption in a certain district is stipulated as follows: the electricity consumption of each household does not exceed 10 kWh per month. Charged at 0.45 yuan per degree. The part exceeding 10 degrees but not exceeding 20 degrees is charged at 0.80 yuan per degree; the part exceeding 20 degrees is charged at 1.50 yuan per degree. In a certain month, user A pays 7.80 yuan more than user B for electricity, and user B pays 4.55 yuan more than user C. So how much is the electricity bill paid by users A, B, and C? (Electricity is charged in whole degrees)
某区对用电的收费标准规定如下：每月每户用电不超过10度的部分．按每度0.45元收费．超过10度而不超过20度的部分，按每度0.80元收费：超过20度的部分，按每度1.50元收费．某月甲用户比乙用户多交电费7.80元，乙用户比丙用户多交4.55元．那么甲、乙、丙三用户共交电费多少元？(用电都按整度数收费)
<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">0.45 * 7</gadget>
<output>3.15</output>

<gadget id="calculator">3.15 + 4.55</gadget>
<output>7.7</output>

<gadget id="calculator">3.15 + 4.55 + 7.8</gadget>
<output>15.5</output>

<gadget id="calculator">3.15 + 7.7 + 15.5</gadget>
<output>26.35</output>

<result>26.35</result>