Calculating Percentages  
What You Need to Know About Calculating Per cent  Online Calculator Included Below  
Free JavaScripts provided To change a fraction into a decimal or a per cent: Begin with 5/8. Take your calculator (or pencil and paper) and divide 5 by 8 to get 0.625, now move the decimal over one place for the per cent. Thus 5/8 = 0.625 and 62.5/100 Applying what you know: You see an item that is $50.00, but it is being reduced by 15%. First you must decide what the amount is that is going to be deducted from $50.00 To do this you will need to multiply 50.009 by .15 (you need to convert 15% to a decimal). The answer is 7.5, now you will need to subtract $7.50 from $50.00, you will be paying $42.50 for the item that is on sale. Try the handy online tool to check your problems on percentages. 
