There are 37 students on a bus the bus stops 5 times. 7 students get off at each stop how many students are left on the bus

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 (%)