In the table, y is directly proportional to x. What is the constant of proportionality represented by the data shown in the table?

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Add the fractions and simplify 1/2+ 1/3

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 (%)