 
 <translate> 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. <ibo> Buru ụzọ chọpụta ego ole Mary na-akwụ kwa izu maka ebe a na-atụfu ihe: $10 / ebe a na-atụfu ihe * 2 ebe a na-atụfu ihe = $20. Mgbe ahụ tinye nke a n'ọnụ ego a ga-eji tụgharịa ihe: $20 + $5 = $25. Mgbe ahụ, mụbaa ego a na-emefu n'otu izu site n'ọnụ ọgụgụ izu a na-emefu n'otu ọnwa iji chọpụta ego a na-emefu n'otu ọnwa: $25 / izu * izu 4 / ọnwa = $100 / ọnwa. Ugbu a, gbakọọ ego a na-akwụ Mary maka ndị agadi: 18% * $100 = $18. Ugbu a, wepụ ego ahụ e belatara ma gbakọta ya na ego ahụ a ga-akwụ gị iji mata ego ole ị na-emefu n'otu ọnwa: $100 - $18 + $20 = $102. Ya mere azịza ya bụ 102. 