Amachine packs boxes at a constant rate of 2/3 of a box every 1/2 minute. what is the number of boxes per minute that machine packs? a 1/3, b 3/4, c 1 1/6, or d 1 1/3

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 (%)