# Interest calculation,

**Simple interest**

Simple interest * k* with

*% anulal interest rate on amount*

**p***(capital, deposit, loan, principal amount):*

**T**Interest factor * q* at anual interest rate

*%:*

**p**The value of amount * T* increased by

**% interest:**

*p***Compound interest**

** T_{n}** - The increased value of initial capital

**over**

*T*_{0}*years at an annual interest rate of*

**n***[%] :*

**p**** T_{n}** - The amortized value of initial capital

**over**

*T*_{0}*years with annual amortization rate of*

**n***[%]:*

**p**The annual discounted value of ** T_{n}** by

*[%]::*

**p**The increased value of the annuity * a* (savings intended for a unit period) over

*years:*

**n****Annuity, loan**

The increased value of the annuity * a* at the end of the

*- th year, if the payment is due at the beginning of each year:*

**n**The increased value of the annuity * a* at the end of the

*- th year, if the payment is due at the end of each year:*

**n**The annual installment of the ** T** loan repayment (annuity), if the repayment is due at the end of each year: