Question: 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? Think carefully first, then make a decision:
First find how much Mary pays weekly for the trash bins: $10 / trash bin * 2 trash bins = $20. Then add this to the cost of the recycling bin: $20 + $5 = $25. Then multiply the week cost by the number of weeks per month to find the monthly cost: $25 / week * 4 weeks / month = $100 / month. Now calculate Mary's senior discount: 18% * $100 = $18. Now subtract the discount and add the fine to find the total monthly cost: $100 - $18 + $20 = $102. So the answer is 102.