b, but I'm not sure. this could very easily be incorrect. you may need to look this up on google first.
Answer:
20%
Step-by-step explanation:
20 * 20% = 4
or you can change it to a decimal
20 * .2 = 4
hope this helped! :)
The answer will be: 1,000,000 if you round to the nearest hundred thousands. Hope it helps! :D