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To calculate interest, multiply the periodic interest rate by the principle amount. For example, if you borrowed $1000 with an interest rate of 10 percent, in a year your interest paid is $100.


To calculate earnings per share, evaluate the total income generated by the company and the number of shares issued. Subtract dividend paid from net income, and divide by the average number of outstanding shares.


A tax interest calculator determines the amount of interest owed on taxes that are paid late, as seen on the New York State Department of Taxation and Finance website. Several state tax websites, including New York and Pennsylvania, provide tax interest calculators, as do third-party services.


The formula for earned value is EV = PC x BAC, in which EV stands for the earned value, PC is the percent complete and BAC is the budget at completion. This formula determines what the estimated value of a project is at different points prior to its completion.


Interest expense is calculated as the interest rate multiplied by the amount of the outstanding principal of the debt. Defined by Investopedia, interest expense is the cost incurred by an entity on borrowed funds.


An Earned Income Tax Credit calculator works by assessing filing status, income and other criteria to see if a taxpayer qualifies for the Earned Income Tax Credit and how much the credit is, reports Bankrate. The EITC benefits low-income working people by reducing their taxes, states the Internal Re


Real interest rate is calculated by adjusting for the effects of inflation when compared to the nominal interest rate. The calculation formula is simple, as it only requires subtracting the rate of inflation from the nominal interest rate. The value left after subtraction is the real interest rate.


Loan interest rates can be calculated with a loan amortization calculator and by knowing whether interest rates are fixed or variable, according to About.com. These methods can help borrowers understand their monthly payments, how much of the payment consists of interest, and how much future payment


The statistic of Earned Run Average, or ERA, is calculated by multiplying the number of earned runs a pitcher has given up by nine, then dividing that number by the number of innings that pitcher has pitched. The equation is (Number of Earned Runs * 9) / (innings pitched).


Both the earned income credit and the child tax credit are calculated based on income in a given year, according to the Internal Revenue Service. The earned income credit is based on adjusted gross income, while the child tax credit is based on modified adjusted gross income.