You can use the proportion \(\frac{is}{of}\) or \(\frac{part}{whole}\) = \(\frac{percent}{100}\), where you fill in what you know, crossmulitply, and solve for x. You can also write it as an equation, where of=mulitply and is=equal to, and the percent is expressed as a decimal. Your two different equations would be .34x120=x and \(\frac{x}{120}\)=\(\frac{34}{100}\)
