Simple Interest and Percent of Change

Front

What is Simple Interest?

Back

Simple Interest is the interest calculated on the principal amount only, without compounding. It can be calculated using the formula: Interest = Principal × Rate × Time.

Front

What is the formula for calculating Simple Interest?

Back

The formula for calculating Simple Interest is: I = P × r × t, where I is the interest, P is the principal amount, r is the rate of interest (in decimal), and t is the time (in years).

Front

If you invest $1,000 at a 5% simple interest rate for 4 years, how much interest will you earn?

Back

Interest = $1,000 × 0.05 × 4 = $200.

Front

What is the Principal in Simple Interest?

Back

The Principal is the initial amount of money that is invested or loaned before any interest is added.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 8% becomes 0.08.

Front

What is Percent of Change?

Back

Percent of Change is a way to express the change in a quantity as a percentage of the original amount. It is calculated using the formula: Percent of Change = (New Value - Old Value) / Old Value × 100%.

Front

If a shirt originally costs $50 and is now $40, what is the percent of change?

Back

Percent of Change = (40 - 50) / 50 × 100% = -20%. This indicates a 20% decrease.

Front

What is the formula to find the total amount after applying Simple Interest?

Back

Total Amount = Principal + Interest.

Front

If you borrow $2,000 at a 6% interest rate for 5 years, what will be the total amount to be paid back?

Back

Interest = $2,000 × 0.06 × 5 = $600. Total Amount = $2,000 + $600 = $2,600.

Front

How do you find the interest rate if you know the principal, interest, and time?

Back

You can find the interest rate using the formula: Rate = Interest / (Principal × Time).