Calculate the average number of grains per square inch at a magnification of 100. Consider grain number is 40?

Calculate the average number of grains per square inch at a magnificat

1.	Calculate the average number of grains per square inch at a magnification of 100. Consider grain number is 40?
A.	5.49*10<sup>9</sup>
B.	5.49*10<sup>7</sup>
C.	5.49*10<sup>11</sup>
D.	5.49*10<sup>6</sup>
Answer» D. 5.49*10<sup>6</sup>