Does anyone know the answers to these ?

I'll give brainliest if you answer right : )

Select the lengths in centimeters that would form a right triangle

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 (%)