ladders used by  fruit pickers are typically tapered with a wide bottom for stability and a narrow top for ease of picking . if the bottom rung of such a ladder is 49 inches wide and the top rung is 19 inches wide . stating explictly the formula used , determine  a. how many rungs does the ladder have if each rung is 2.5 inches shorter than the one below it ? b. how much material would be needed to make the rungs for the ladder?

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