Please help me solve this question and show ALL work! this is for an analytical chemistry Class!

Question 9 - Use equation editor in Word to answer this question. Do not put the question in your word document, just your answer. ( 8 points) The concentration of a pharmaceutical contaminant in river sediment can be determined by first extracting the contaminant with methylene chloride. The extract is then diluted, if necessary, and the contaminants are separated by HPLC. Calibration is achieved using one or more external standards. In a typical analysis, a 2.013g sample of dried soil is extracted with 20.00mL of methylene chloride. After filtering to remove the sediment, a 1mL portion of the extract is removed and diluted to 10mL with acetonitrile. Injecting 5 microliters of the diluted extract into the HPLC instrument gives a signal of 0.264. When 5 microliters of a 20.0ppm standard is analyzed a signal of 0.286 is measured. Report the parts per million ( g/g 106 ) of the contaminant in the original sediment