“I've worked it out, including rent and food.”
Work something out means to calculate an answer or think through the details. Tina has calculated how much she can save each month after allowing for rent and food.
B1-26 / CEFR B1 / EPISODE 26
Making a small saving concrete
SceneTina has brought a list of her monthly expenses to a meeting with a financial planner.

WORDS & CONTEXT
Work something out means to calculate an answer or think through the details. Tina has calculated how much she can save each month after allowing for rent and food.
Cut back on something means to reduce its amount or frequency. To stop completely, use cut out or give up. Tina considers buying fewer matcha lattes.
Every little bit helps. says that even small contributions are useful, close to the Japanese saying about dust accumulating into a mountain. It commonly encourages donations or savings.