# 1. Goal

A company pays a monthly commission to its sales agents. A payroll program
calls one calculation for each agent and each month. The calculation returns
the commission of one agent.

# 2. Open questions

None.

# 3. Context

- The interface {{P}}IF_COMMISSION exists in package $TMP. It is active.
- The interface contains the type TY_AMOUNT. TY_AMOUNT is a packed number
  with length 15 and 2 decimal places.
- The interface contains one method:

  CALCULATE
    IMPORTING iv_sales        TYPE ty_amount
              iv_target       TYPE ty_amount
              iv_years        TYPE i
    RETURNING VALUE(rv_bonus) TYPE ty_amount

- iv_sales is the sales volume of the month.
- iv_target is the monthly target of the agent.
- iv_years is the number of completed years of service of the agent.

# 4. Contract

- Create the class {{P}}COMMISSION_CALC in package $TMP.
- The class is public and final. The class has a public constructor without
  parameters.
- The class implements the interface {{P}}IF_COMMISSION.
- Do not add other public methods.

# 5. Business rules

Apply the rules in this sequence.

1. If iv_sales is zero or negative, or if iv_target is zero or negative,
   return 0.
2. If two times iv_sales is less than iv_target, return 0.
3. Calculate the commission. Keep the full precision. Round only in rule 4.
   a. Add 1 percent of the part of iv_sales that is at most iv_target.
   b. If iv_sales is more than iv_target, add 3 percent of the part of
      iv_sales that is more than iv_target. Use at most half of iv_target
      for this part.
   c. If iv_sales is more than 1.5 times iv_target, add 5 percent of the
      part of iv_sales that is more than 1.5 times iv_target.
4. Round the commission to 2 decimal places. Use commercial rounding.
5. Add the loyalty bonus. Add 500 if iv_years is 10 or more. Add 200 if
   iv_years is 5 or more. Add 0 in all other cases.
6. If the result is more than 5000, return 5000.
7. Return the result.

# 6. Constraints

- Release target: 7.40 SP05. Use only language elements that this release
  supports. Do not use language elements of a later release.
- Coding standards: Clean ABAP. Method length below 40 statements. No global
  variables. No comment that restates the code.
- Out of scope: do not change the interface {{P}}IF_COMMISSION.

# 7. Acceptance

- The class is active and has no syntax error.
- The hidden tests pass.
- Write your own ABAP Unit tests for the class.