How do I prepare 100 mL of a 100 ppm iron solution from a 1000 ppm stock solution using water? then Prepare a set of fiv

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How do I prepare 100 mL of a 100 ppm iron solution from a 1000
ppm stock solution using water?
then Prepare a set of five standards in 50 mL
volumetric flasks such that the iron concentrations
are 0, 2, 4, 6, and 10 ppm. And add 20 mL of the unknown water
sample to each standard, then dilute to the mark with distilled
water.