Mary is paying her monthly garbage bill for a month with exactly four weeks. The garbage company charges Mary $10 per trash bin and $5 per recycling bin every week, and Mary has 2 trash bins and 1 recycling bin. They're giving her an 18% discount on the whole bill before fines for being elderly, but also charging her a $20 fine for putting inappropriate items in a recycling bin. How much is Mary's garbage bill?
First find how much Mary pays weekly for the trash bins: $10/trash bin * 2 trash bins = $
<gadget id="calculator">10*2</gadget>
<output>20</output>
20.
Then add this to the cost of the recycling bin: $20 + $5 = $
<gadget id="calculator">20+5</gadget>
<output>25</output>
25.
Then multiply the week cost by the number of weeks per month to find the monthly cost: $25/week * 4 weeks/month = $
<gadget id="calculator">25*4</gadget>
<output>100</output>
100/month.
Now calculate Mary's senior discount: 18% * $100 = $
<gadget id="calculator">18*.01*100</gadget>
<output>18</output>
18.
Now subtract the discount and add the fine to find the total monthly cost: $100 - $18 + $20 = $
<gadget id="calculator">100-18+20</gadget>
<output>102</output>
102.

<result>102</result>