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Using PHP Create A Loan Calculator That Allows For Extra Payments

Requirements:

-Create a page that allows a user to enter loan information; including Loan Amount, Length of Loan (months or years), Annual Interest Rate (percentage), and Extra Payment Amount.

-Loan Amount is in dollars. This field is required.

-Length of Loan is an integer in months or years. Include a prompt (such as radio buttons or dropdown list) to indicate payment frequency is for months or years. This field is required.

-The loan calculation should adjust appropriately based on months or years selection.

-Annual Interest Rate should be entered as a percentage. This field is required.

-Make sure that all required fields are entered.

-Make sure that all entered fields are valid.

-Display the results of the loan calculation.

-Display the Monthly Payment Amount.

-Display the Total Amount to be paid for the loan (principle and interest).

-Display the Total Interest to be paid for the loan.

-Display an Amortization Schedule for the loan.

-Assume the loan starts on the first day of the following month.

-In the Amortization Schedule show the Payment Number, Payment Date, Payment Amount, Principle Amount, Interest Amount, Extra Payment Amount (if entered), and Loan Balance.

Extra Credit:

-Extra Payment Amount is in dollars and is an additional monthly amount paid towards the principle of the loan. This field is optional.

-If Extra Payment Amount is entered, it must be included in the loan calculation.

-The Extra Payment Amount should be included as part of the monthly payment.

-If Extra Payment Amount is entered, display the Amount of Interest Saved and the Amount of Time Saved.

-Store the values entered in cookies and auto populate fields with previous values from cookies.

Hints:

-Find a formula to calculate the payment amount.

-To use the formula you will need to calculate a few things based on the user input.

-You will need to know the number of monthly payments for the loan. Your formula might call this the length of the loan.

-You will need to know the interest rate per month.

-Now you can start.

-Calculate the number of monthly payments.

-Calculate the interest rate per month.

-Calculate the payment amount.

-You should test this by calculating manually on paper and using a php fiddle to test your code calculations.

-Compare your results to any online mortgage calculator.

-Now use a loop to display each month of the amortization table.

-For each month calculate the balance and the portion of the payment that is principal and interest.

-For the first month, the balance is the same as the loan amount.

-The interest portion of the payment for that month is the balance times the interest rate per month.

-The principal portion of the payment for that month is the payment amount minus the interest portion.

-The balance for that month is the balance from the previous month minus the principal portion of the payment.

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