PSAT Math Multiple-Choice Practice Question 540

Question: 540

Maria plans to purchase a new cell phone for her existing data plan. The cell phone will have a 6.5% sales tax on the purchase price, plus a flat fee of $20 for the phone charger. She has already used 2 Gigabytes of data this month, and her limit is 7 Gigabytes. Maria uses data for 2 hours each day and uses 0.25 Gigabytes for each of those hours. She will use the equation , where m is the number of minutes of power and n is the number of kilowatt-hours of electricity, to determine her charge efficiency, p.

Which of the following formulas can Maria use to determine the number of kilowatt-hours of electricity she needs to power her cell phone for a certain number of minutes?

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