500-20%

To calculate 20% of 500, you can multiply 500 by 0.20:

20% of 500 = 0.20 * 500 = 100

So, subtracting 20% (100) from 500:

500 - 100 = 400

Therefore, 20% of 500 is 100, and 500 minus 20% of 500 is 400.