budgeting

Hi,

please help me with below.
A company manufactures a single product M.
Budgeted production output is 200 units.
Each unit requires 6 hours labour work for completion and the company anticipates 20% idle time.

Labour is paid at a rate of 7$ per hour. What is the direct labour cost budget?

my calculations were

total hours 200x 6 so 1200 hours which are 80% from total hours because we do have 20% idle time so total hours are 1500.
1500×7$ 10500 total cost

in the book the answer is 8400 or maybe I am going mad. 🙁