Someone please help me ​

This is different from the first one can someone me

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

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 (%)