Hamiltonian Rose Boyce-Timutimu knows a small cup of oats costs 12 cents, a cup of rice costs 63 cents, and a teaspoon of peanut butter costs 23 cents.
She also knows that chewing on a raw carrot helps keep hunger pains at bay.
Why does Rose know these things? Because for the last week she has been taking part in Live Below The Line, a charity awareness campaign aimed at raising money and awareness to help the estimated 21 million people trapped in slavery.
Participants have to survive on $2.85 a day to simulate how those below the poverty line live.
The interview begins with Rose asking if she can eat while we talk - it feels like a long time since breakfast.