[WooCommerce 1.6.5.2] Add custom fee in Shopping Cart

Hi! I had a difficult task, so I need your help, guys.
I need some fixes in shopping cart.
1. If a customer buys less product that costs less than 1000kr, then 200kr needs to be added to the price. The 200kr should be added as a new product in the checkout. So.. if you buy one product, the checkout should be:
U-st?ng: 168kr,
Starting cost: 200kr,
Pic 1
Pic 2
https://metalldirekt.se/produkt/u-stang-3/
Best regards!