Answer:
A
Potential market
Interested percentage of people x total population
1000000x20%
= 200000
B.
Mass market is potential market x those with requisite income in percentage
= 200000x50%
= 200000x0.5
= 100000
C
Available market is also mass market
= 100000
D.
Qualified market
Available market x minimum qualification in percentage
Percentage of Minimum qualification = 100 - 25%
= 75%
Qualified market = 100000x0.75
= 75000