G'day, it has been too long away from school for me. I need to work out how much over spot price the purchase price I paid as a percentage. So if I bought 100 ozs of silver for $3257 and the spot price at the time was say $28.17 per oz. How much as a percentage over spot price did I pay? Spot price is $28.17, Cost price is $32.57 per oz. Anyone out there know the formula? many thanks in advance, regards Neil