Question

one year after robin deposits 400 dollares in a savings account that pays r % annual interest, how much money is in the account? write an expression using the variable r.

Answer 1

To calculate the amount of money in the savings account after one year, we need to consider the initial deposit of $400 and the interest earned over the year.

The interest earned can be calculated by multiplying the initial deposit by the annual interest rate expressed as a decimal. Since the interest is given as a percentage, we divide it by 100 to convert it to a decimal.

Let's represent the amount of money in the account after one year as A.

A = 400 + (400 * (r/100))

In this expression, "r" represents the annual interest rate as a percentage. By substituting the value of "r" with the given interest rate, you can find the amount of money in the account after one year.

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