Solution of task 3.1.1 from the collection of Kepe OE

If the total amount of your purchases from the seller Михаил_Перович more than:
- 200 $ the discount is 15%
- 100 $ the discount is 10%
- 50 $ the discount is 7%
- 20 $ the discount is 5%
- 10 $ the discount is 3%
- 5 $ the discount is 2%
- 1 $ the discount is 1%

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3.1.1
How many independent unknown quantities can be determined for a statically definable system of three bodies under the action of a plane system of forces? (Answer 9)