Marmite or Kangaroo meat, anyone?

Discrete Mathematics Level 1

A local grocery store in the outback newly opened. They were offering 1 free bottle Marmite to every $11^\text{th}$ customer and 1 free pound of kangaroo meat for every $13^\text{th}$ customer. If there were 1000 customers that visited them on opening day, how many customers walked away with free goodies?