Interest
Rates
Compound
Interests
Instalment
Savings
Payment by
Instalments
Write off
Values

 linear

 dgres

 progres

 lease
 X:   Y:   Z: 

 X(R)

 Y(S)

 X(S)

 Y(R)

 X(R) & Y(S)

 X(S) & Y(R)
Result: 
  
      The usage time has expired !