dpi (dots per inch) is a printer specification determined when you set your print parameters. Pehaps you are referring to ppi (pixels per inch) which is a screen image specification. Neither of these, of course, are determined by the camera. In any event, it is really a non-issue (at least, in the current discussion) because neither number means anything as far as image size is concerned. A 100 ppi image 10" by 6" is the same "size" as a 50 ppi image that is 20" by 12" or a 200 ppi image that is 5" by "3." To verify, change the ppi to another number and do the the math (or check the file size using the "save as" option).
Ron