DM1.1 - how much iron is there in dried thyme? Questions

I did this practical at school today and I'm really confused about the calculation questions.
Average titre on MnO4-: 19.45 cm^3
Concentration of MnO4-: 0.005 mol dm-3
I worked out that there were 9.725 x 10^-5 moles in the average titre.
We added the manganate solution to a solution made of thyme containing Fe2+. The ratio is 1 MnO4-: 5Fe2+. I worked the moles of Fe2+ out to be 4.8625 x10 ^-4.
This was for a 25cm3 solution.
We made a 250 cm3 solution using 1g of thyme.
I need to work the mass of thyme in 100g out. I multiplied 4.8625 x10 ^-4 by 10 to get moles in 250 cm3. I then x by 55.8 to get mass in 250 cm3/ mass in 1g. I got o.271 g. This is much too high, it is meant to be only 1 mg per g. I'm not sure where I have gone wrong here.