Divide. Write your answer as a fraction or mixed number in the simplest form.

-10/21÷15/7

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What are different types of statistical programs

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 (%)