Jane spent $15.75 to purchase cookies and brownies for 25 of her classmates. cookies cost $0.50 and brownies cost $0.75. how many of each type of snack did jane buy?

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 (%)