Selected information for Global Filter Company is given below.

2021

2020

2019

2018

2017

Sales $291,840 $284,160 $271,360 $266,240 $256,000

Cost of goods sold 221,100 217,080 211,050 205,020 201,000

a) Calculate the percentage change for these items using 2017 as the base year. Please make sure your final answer(s) are in percentage form and are accurate to the nearest whole percent. (For

example: 12%)

b) Assuming all other things are constant, indicate whether the trend in cost of goods sold is favorable or unfavorable compared to the trend in sales.

The trend is (select one) .