The total cost of 2 identical files and 1 pen is $19.05. The total cost of 3 such files and 5 such pens is $44.50. Find the cost of 1 pen.
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Step-by-step explanation:
183 estimated upwards = 200
153 estimated downwards = 100
Hence, the estimated product = 200 x 100 = 20000.
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