What is the concentration in parts per million of DDT in each of the following?

Part 1 of 2

0.060 mg in 1100. g plankton. Be sure your answer has the correct number of significant figures.
Note: Reference the SI prefixes table for additional information.

ppm DDT

0.060 mg = 0.000060 g

Concentration of DDT = (0.000060 g / 1100. g) * 10^6 = 54.55 ppm

Therefore, the concentration of DDT in 0.060 mg in 1100. g of plankton is 54.55 ppm.