Interest calculation,

Simple Interest
Interest i for the principal P with an interest rates of r %:
Interest coefficient q in case the interest rate is r %:
Increased value of principal P increased with interest at the interest rate of r %:
Compound Interest
Value of principal Pn after n years with an interest rate of r % in case of starting principal P0:
Value of principal Pn after n years with an amortization rate of r % in case of starting principal P0:
Discount value of principal Pn with an interest rate of r %:
Increase of annuities a after n years:
Investment
Availabel amount after n years in case of annuity investment a (amount, invested each year),
if the payment is at the beginning of each year:
Availabel amount after n years in case of annuity investment a (amount, invested each year),
if the payment is at the end of each year:
Installment (annuity) of the loan P on an annual basis, if the repayment rate is due at the end of the year: