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The density of gasoline is 730 kg/m3 at 0°C. Its average coefficient of volume expansion is 9.60 10-4 / C°. Assume 1.00 gal of gasoline occupies 0.00380 m3 How many extra kilograms of gasoline would you get if you bought 15.0 gal of gasoline at 0°C rather than at 22.0°C from a pump that is not temperature compensated?

Converting to KG then using the volumetric expansion equation (change if V = V times beta times delta T), I got the answer .879. I checked with friends and what not and they all seem to be getting the same answer but it says it's wrong and within 10% of the value. I get the same incorrect response for other very similar problems. Anyone know what is wrong?