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Mathematics, 19.02.2020 02:51 aharvitt0417

For a basic monthly fee of F yen (¥F), Naoko’s first cell phone plan allowed him to use a maximum of 420 minutes on calls during the month. Then, for each of x additional minutes he used on calls, he was charged ¥M, making his total charge for the month ¥T, where T = F + xM. What is the value of F ?

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