exam Maths Puzzle Numerical Ability

A garden store uses a markup of 33 1/3% on cost to price items. If the store buys a planter for $9, then its selling price on this item is ?

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An airplane flew for 6 hrs w/ a 22-km/h tail wind.THe return flight against the same wind took 8 hrs.Find the speed of the plane in still air. For a sample of size n=60, proportion p=0.35, and 95% confidence level, the lower bound of the proportion is ______?