A scientist investigated the radiation sensitivity of different mammals to x-rays to determine the LD50 within 30 days. Results from the study are included below. Based on the LD50 data in the table, which of the following equations should be used to calculate how many times greater the resistance of a rabbit to x-rays is than that of a dog?
A 800 - 325
B 800 + 325
C 800 * 325
D 800/325