Answer:
The correct answer is = 2.5× 10^7.
Explanation:
Colony Forming Units/ml (CFU/ml) in the original sample can be calculated by the countable plate is multiplied by 1/FDF.
Given:
colonies counted on the plate = 250
Forming dilution factor = 10^5
solution:
CFU/ml = 250 x 1/1/100000
= 250 CFU x 100000
= 250,00,000 CFU/ml
= 2.5× 10^7
