d$.$ Drum scanner

I have an image that is $2400$ pixels wide by $3600$ pixels high. I am using a printer that prints $300$ pixels per inch. What size of image in inches can I print? Show all steps clearly. You can I have a photo I want to scan into the computer to have a resolution of $1800$ pixels by $2400$ pixels. The photo is $4$ by $6$ inches in size. What scanning resolution should be used?