I am stuck on a simple question that I belive could be a trick.

it says -

A 50kg body hangs at rest from a rope wrapped around a pully 15cm in diameter. what is the torque about the axis?

the formula I have used for a similar question is

Torque = Force x distance

Force= Mass x Acceleration

seeing as there is no acceleartion in this problem do i assume that Force is equal to 50kg ie 50Newtons or should i have to mulitiply by gravity (9.81) and assume this is the accelartion?

would the distance be 15cm or .15m and where is the axis of a pulley?? please help