What is the difference in total price between the two repairs, including gratuity? $172.50 $198.38 $210.13 $250.25

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 (%)