Question

6. Compound Interest
When a bank account pays compound interest, it pays interest not only on the principal amount that was deposited into the account, but also on the interest that has accumulated over time. Suppose you want to deposit some money into a savings account, and let the account earn compound interest for a certain number of years. The formula for calculating the balance of the account after a specified number of years is:

? = ?(1 + ?)???

The terms in the formula are:
A is the amount of money in the account after the specified number of years.P is the principal amount that was originally deposited into the account.
r is the annual interest rate.
n is the number of times per year that the interest is compounded.
t is the specified number of years.

Write a program that makes the calculation for you. The program should ask the user to
input the following:
• The amount of money you want to make in the account after the specified number of years.
• The annual interest rate paid by the account as a decimal number.
• The number of times per year that the interest is compounded (For example, if interest
is compounded monthly, enter 12. If interest is compounded quarterly, enter 4.)
• The number of years the account will be left to earn interest
Once the input data has been entered, the program should calculate and display the principal amount you have to deposit into the account.

Answer 1

#In python

A=float(input('Enter amount of money you want to make in the account after the specified number of years: '))
r=float(input('Enter annual interest rate paid as a decimal: '))
n=int(input('Enter number of times per year the interest is compounded:'))
t=int(input('Enter number of years the account will be left to earn interest: '))

P=A/(1+r/n)**(n*t)

print('Principal amount you have to deposit into the account: ${:.2f}'.format(P))