Luke 8 tells us how Jesus funded His and the Twelves ministry as they traveled around Israel for almost three years. The disciples had a purse to hold money, and Judas was the treasurer to manage the daily expense of traveling and ministering. What's interesting is WHO is doing the funding. Three women were called out by name amongst "many others".

It was not unusual for Rabbis to receive financial help from their disciples. What was unusual are three women listed contributing from their resources to support Jesus and the disciples.
Mary Magdalene, Joanna, and Susanna. Mary was from Magdala, a nondescript small nowhere town. Some have thought of her to be a prostitute, but this is not supported by scripture. She was demon-possessed, and Jesus healed her. Joanna was the wife of Herrod's business manager and was wealthy and socialized in the upper strata of society. Both, by the way, were at the cross and watched Jesus die. We never hear of Susanna after this mention.

Three women, all with means and from different backgrounds, became devoted followers of Jesus and supported His ministry financially. Two from opposite ends of the socio-economic scale and a non-descript woman we know nothing about. What they had in common was that Jesus had impacted their lives, and they felt the need to help with His ministry financially. Paul also espouses financial support for ministers in Galatians.

Did they give 10%? We don't know, amounts are not mentioned. It could have been less, could have been more. It's just free-will generosity from the hearts of people that Jesus has touched, and it's been going on for two thousand years.

And that's how ministry gets funded.