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Mathematics, 03.03.2021 07:40 helo55

Jack Deere made a deal with this father that he would mow the lawn for the entire summer. For the first mowing, he would charge a special introductory rate of $4, but for each mowing thereafter he would charge 85 cents more than the
previous rate. If Jack mowed the lawn a total of 21 times during the summer, how much did he earn in all?

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