Class: Formulas::LoanPrincipalCalculator

Inherits:
Object
  • Object
show all
Defined in:
lib/formulas/loan_principal_calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#apr ⇒ Object

Returns the value of attribute apr.



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# File 'lib/formulas/loan_principal_calculator.rb', line 5

def apr
  @apr
end

#months ⇒ Object

Returns the value of attribute months.



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# File 'lib/formulas/loan_principal_calculator.rb', line 5

def months
  @months
end

#repayment ⇒ Object

Returns the value of attribute repayment.



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# File 'lib/formulas/loan_principal_calculator.rb', line 5

def repayment
  @repayment
end

Instance Method Details

#divide_by ⇒ Object 



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# File 'lib/formulas/loan_principal_calculator.rb', line 7

def divide_by
  interest_with_principal - 1
end

#interest_with_principal ⇒ Object 



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# File 'lib/formulas/loan_principal_calculator.rb', line 11

def interest_with_principal
  (1 + (apr / 12)) ** months
end

#principal ⇒ Object 



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# File 'lib/formulas/loan_principal_calculator.rb', line 15

def principal
  (((repayment * divide_by) / interest_with_principal) * 12 ) / apr
end