Table:
text: Retina Display
Retina Display models
Retina Display models
Model PPI_pixels_per_inch_ ppcm_pixels_per_cm_ Resolution Typical_viewing_distance_in_cm Pixels_per_degree_PPD
iPhone 4 / 4S and iPod Touch (4th generation) 326 128 960×640 inches (cm) 57
iPhone 5 / 5S / 5C and iPod Touch (5th generation) 326 128 1136×640 inches (cm) 57
iPad ( 3rd / 4th generation / iPad Air ) 264 105 2048×1536 inches (cm) 69
iPad Mini (2nd generation) 326 128 2048×1536 inches (cm) 85
MacBook Pro with Retina Display 15 220 87 2880×1800 inches (cm) 77

Question: How many different PPI does the model with ppcm of 87 have in the retina display?

Question: What is the resolution of the model with a PPD of 69 for Retina Display?