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Final answer:The totalcostfor using 100 diapers is calculated by adding the cost for using first 75 diapers with the cost for using additional diapers. The cost for 75 diapers at $.30 each is $22.50, and the cost for an additional 25 diapers at $.025 each is $6.25. Adding these costs together results in a total cost of $28.75.Explanation:The diaperservicecharges $.30 each for the first 75 diapers, and $.025 for each additional diaper thereafter. If a family uses 100 diapers in a week, this family would be charged for 75 diapers at $.30 each and 25 diapers at $.025 each.To calculate the costs:First 75 diapers: 75 * $.30 = $22.50Additional25 diapers: 25 * $.025 = $6.25Therefore, thetotalbill would be $22.50 (for the first 75 diapers) + $6.25 (for the additional 25 diapers) = $28.75.Learn more about Cost here:brainly.com/question/34783456#SPJ11...