you can calculate the percentage of anything by following these simple steps:1. convert your percentage to a decimal. So 4% would be 0.04 and 10% would be 0.10 and 58% would be 0.58 and so on. 2. Multiply your decimal to the number that you want to find the percentage of. there you go! so 4% is 0.04 in decimal form 0.04 times 10000 equals 400. so your answer is 400