# 1. Goal
Calculate the monthly fee for a child at a day care centre. The billing program
calls the calculation for each child before it creates the invoice. The program
needs the fee and one reason code for each child.

# 2. Open questions
None.

# 3. Context
- The class {{P}}CHILDCARE_PRICER does not exist yet. Create it in package $TMP.
- The billing program is not part of this task. It calls the calculation for
  each child and reads the reason and the fee.

# 4. Contract
- Create the class {{P}}CHILDCARE_PRICER in package $TMP.
- The class is public, final, and has a public constructor without parameters.
- Define these public types:
  TY_AGE_BAND  TYPE c LENGTH 4
  TY_REASON    TYPE c LENGTH 6
  TY_AMOUNT    TYPE p LENGTH 8 DECIMALS 2
  TY_RESULT    a structure with the components REASON (TY_REASON) and
               FEE (TY_AMOUNT)
- Define the public constant structure C_REASON with the components OK, AGE and
  DAYS. Each component has the type TY_REASON.
- Add one public method:
  CALCULATE
    IMPORTING iv_age_months TYPE i
              iv_days       TYPE i
              iv_full_day   TYPE abap_bool
              iv_sibling    TYPE abap_bool
    RETURNING VALUE(rs_result) TYPE ty_result
- Do not add other public methods.

# 5. Business rules
Apply the rules in this sequence.
1. If iv_age_months is less than 3 or more than 60, return the reason AGE and
   the fee 0.
2. If iv_days is less than 1 or more than 5, return the reason DAYS and the fee
   0.
3. Find the age band of the child:
   3 to 11 months: BABY
   12 to 35 months: TODD
   36 to 60 months: PRE
4. Find the daily rate of the age band:
   BABY: 62.00 for a full day, 38.00 for a half day
   TODD: 54.00 for a full day, 33.00 for a half day
   PRE: 46.00 for a full day, 28.00 for a half day
   iv_full_day = abap_true means a full day. All other values mean a half day.
5. The monthly fee is the daily rate multiplied by iv_days and by 4.348. Round
   the result to 2 decimal places.
6. If iv_sibling = abap_true, multiply the monthly fee by 0.9 and round the
   result to 2 decimal places.
7. If the monthly fee is more than 1050.00, set it to 1050.00.
8. Return the reason OK and the monthly fee.

# 6. Constraints
- Release target: 8.16.
- Coding standards: Clean ABAP. Method length below 40 statements. No global
  variables. No comment that restates the code.
- Out of scope: no other object.

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