Literal question
S3_Q09_unit==1 ? AREA_PLANTED : (S3_Q09_unit==2 ? AREA_PLANTED/100 : AREA_PLANTED/10000)
AREA_PLANTED: (S3_Q09a ?? 0) + (S3_Q09b ?? 0)
S3_Q09a. What area of %rostertitle% was planted from 1 July 2019 through 30 June 2020?
S3_Q09b. What was the average area of %rostertitle% planted from 1 July 2019 through 30 June 2020, over the %S3_Q08% times you planted it?