revenue this year $450,000  last year $360,000 CGS this year $270,000  last year $240,000 Labor exp this year $60,000  last year $40,000 Operating...

revenue this year $450,000  last year $360,000

CGS this year $270,000  last year $240,000

Labor exp this year $60,000  last year $40,000

Operating income this year $27,000  last year $26,000

Income tax expense this year $5,400 last year $3,600

what does a vertical analysis of income statements show regarding this year's activity compared to last year's activity?

A a favorable change in operating income this year

b a favorable chang in CGS this year

c a 20% increase in revenue this year

d a favorable change in labor expense this year