1. A submarine went 200 feet below the surface of the ocean. The surface of the ocean has an elevation of 0 feet. Which number represents the elevation of the submerged submarine?​

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 (%)