Table:
0
A
B
C
D
E
1
Year of election
Candidates elected
# of seats available
# of votes
% of popular vote
2
1934
1
90
n.a.
7.0%
3
1937
0
90
n.a.
5.6%
4
1943
34
90
n.a.
31.7%
5
1945
8
90
n.a.
22.4%
6
1948
21
90
n.a.
27.0%
7
1951
2
90
n.a.
19.1%
8
1955
3
98
n.a.
16.5%
9
1959
5
98
n.a.
16.7%

Questions and formulas:
Question: What is the percentage of the popular vote when there were 90 seats available?
Formula: LET(query1,SUMMARIZE(E1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)=90))
Formula2: LET(query1,SUMMARIZE(E2:E9,SUMX(C2:C9)),FILTER(query1,CHOOSECOLS(query1,2)=90))
Level: hard