Table:
0
A
B
C
D
E
F
G
1
Date
Type
Category
Model
Amount
Total
Sales
2
1/1/2007
BMW
Compact
BMW 3-Series
142490.0
23523.0
23523.0
3
1/1/2008
BMW
Compact
BMW 3-Series
112464.0
23420.9
23432.0
4
1/1/2009
BMW
Compact
BMW 3-Series
90960.0
2342.2
23.0
5
1/1/2010
BMW
Compact
BMW 3-Series
100910.0
23423.2
234

Questions and formulas:
Question: total amount of sales
Formula: SUM(G1)
Formula2: SUM(G2:G5)
Level: easy
Question: total unk by category excluding compact
Formula: LET(query1,FILTER(A1:G1,C1<>"compact"),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,6))))
Formula2: LET(query1,FILTER(A2:G5,C2:C5<>"compact"),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,6))))
Level: hard