Amolecular biologist measures the mass of cofactor a in an average yeast cell. the mass is 74.06 pg . what is the total mass in micrograms of cofactor a in a yeast colony containing 105 cells

We know that one cell of yeast is 74.06 pg. To know the total mass of 105 cells, we will simply use cross multiplication as follows:
total mass = (105 x 74.06) / 1 = 7773.15 pg.

Now, we need to change pg to micro-grams.
From the standard units conversions, we know that:
1 pico is equivalent to 0.000001 micro.
Therefore,
total mass = (7773.15 x 0.000001) / 1 = 0.00777315 micro-grams
                 = 7.77315 x 10^-3 micro-grams

What are the choices?