Well lets start of by declaring our percentage to be x. Now, whenever we see the english word "is", we translate that into math as "=". Likewise, we translate "of" as "*". Thus if we have 20 is what percent of 3400, we translate it as 20=x*3400. From here you can divide both sides by 3400 to get x=0.00588. Now to convert from decimal to percent, we move the decimal place two places to the right. So we get x=0.588%