In an investigation, Detective Tracy discovered a photograph that showed his number one suspect at the scene of the crime. To get a better look, he enlarged the picture by a scale factor of 51. If the original photo measured 4 inches by 3.2 inches, what were the dimensions of the enlargement?
20 inches by 12 inches
16 inches by 18 inches
15.6 inches by 20 inches
20 inches by 16 inches