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As said - depends on size. What are the pixel dimensions of the cropped image?
For a decent A5 size print you want something at an absolute bare minimum of 150dpi. That equates to any image over 874x1240 pixels being useable at A5. If I'm printing anything I tend to want a minimum of 300 dpi, meaning 1748x2480 pixels at A5.
Also, bear in mind that if you save as jpg you should use maximum quality; it's very easy for jpg file compression to introduce nasty artifacts.