32.
									
										A bacterial culture contained 32x10^6 cells after 2.5 hours of exponential growth. If the doubling time was 30 min, what was the initial population number in this culture ? 
									
								
															
														
																									
										A:
											20x10^4 cells
									
																										
										B:
											10x10^5 cells
									
																										
										C:
											40x10^5 cells
									
																										
										D:
											16x10^6 cells
									
																								 
							
																
									The answer is:
										B