my dream job

I have a job want with.
I want to become a bank employee.
I like the calculation.
And I  good at mental arithmetic.
I want to make the calculation, I want to be a bank employee.
A bank is important.
You have to make it prudent in treating money.
I would like to do work which manages it.
It is serious to become a bank clerk.
Since it becomes a bank clerk, I have to do my best.