Before you attempt this very wordy question a flow chart may prove beneficial, as shown below.

   

Step 1 .Draw the calibration curve

Step 2 Read off the graph the concentration of the sample tested.

Step 3 Calculate the amount of lead in the 2.00 mL sample.

Step 4 Working backwards we now calculate the amount of lead in the 30.00mL sample from which the 2.00mL sample came from.

Step 5 Calculate the amount of lead in the 10.00mL sample of filtrate.

Step 6 Calculate the amount of lead in the 50mL solution before filtering.

Step 7 Calculate the amount of lead in the meat in ppm(m/m) (1g/106g)