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2 A tunnelling machine drills 500 metres. Use your values from the table to estimate the cost of drilling if the first metre costs EX and each extra metre costs Y. Y Q2 X 1000 1050 1100 1150 1200 1000 1050 1100 1150 1200 1000 1050 1100 1150 1200 1000 1050 1100 1150 1200 100 100 100 100 100 110 110 110 110 110 105 105 105 105 105 120 120 120 120 120