What percent of 71 is 27

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 (%)

Iam at home. /: i am playing video games. translate the following statement into symbolic form.

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale