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Name the most appropriate metric unit for each measurement like the mass of cow

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Askateboard ramp is in the shape of a right triangle what is the height of the ramp