I need help With this I'm taking the test now
I'm giving 80 point's please help!!!

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 (%)

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Express -5 2/5 as an improper fraction.