How can I tell the dpi on iPhoto?

I have had a request to send a photo of my artwork. The request states that it needs to be "at least 300 dpi at 8 inches X 10 inches." How can I tell if my images meet this requirement?
Thanks!

DPI is not a setting - it is a calculation - DPI  --  Dots Per Inch  --  as you remember from sixth grade math per means divided by - - Dots per inch is Dots (pixels in this case) divided by inches
So to print a 8" x 10" photo at 300 DPI you need a minimum of 8*300 x 10*300 dots - so if your photos is 2400x3000 or larger you got it
LN

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