KAlgebra/Credit payment: Difference between revisions

From KDE Wiki Sandbox
No edit summary
No edit summary
Line 35: Line 35:
{{Input|1=amount:=(monthlyPayment,months)->monthlyPayment*months}}
{{Input|1=amount:=(monthlyPayment,months)->monthlyPayment*months}}


[[File:Screenshot2.png|600px]]
[[File:Screenshot02.png|600px]]

Revision as of 21:10, 18 December 2010

Formula for calculating compound interest:

Where,

A = final amount

P = principal amount (initial investment)

r = annual nominal interest rate (as a decimal)

n = number of times the interest is compounded per year

t = number of years

Write all these functions in Console Mode

1.This Function calculates the monthly interest rate by given yearly interest rate.

monthlyInterestRate:= yearlyInterestRate-> yearlyInterestRate/1200

2.This function calculates the monthly payment

  • mir=monthlyInterestRate
monthlyPayment:=(sum, mir, months)->(sum*(1+mir)^months*mir)/((1+mir)^months-1)

3.This Function calculates the whole amount you have to return to the bank

amount:=(monthlyPayment,months)->monthlyPayment*months