help me plz i don't even know if the first one is correct

Here's what i got:
Answer:
A)
2.2 * 10^7
B)
0.072 = 7% are female
C)
0.10455 * 22,000,000 = C
0.10455 * 22,000,000 = 2,300,100
D)
0.0195 = 2% of the living veterans served in both.