The following information is available for blue spruce corp. for three recent fiscal years.

2017
2016
2015
inventory $545,441 $570,212 $333,435
net sales 1,953,922 1,736,880 1,290,976
cost of goods sold 1,564,507 1,305,533 944,111

calculate the inventory turnover, days in inventory, and gross profit rate for 2017 and 2016.