Percent of Change and Simple Interest

Front

What is Percent of Change?

Back

Percent of Change is a measure of how much a quantity has increased or decreased relative to its original amount, expressed as a percentage.

Front

How do you calculate Percent of Change?

Back

Percent of Change = ((New Value - Old Value) / Old Value) x 100.

Front

If a class size increases from 27 to 30, what is the percent of change?

Back

Percent of Change = ((30 - 27) / 27) x 100 = 11%.

Front

If a video game level time decreases from 32 minutes to 28 minutes, what is the percent of change?

Back

Percent of Change = ((28 - 32) / 32) x 100 = -12.5% (decrease).

Front

What is Simple Interest?

Back

Simple Interest is the interest calculated on the principal amount only, without compounding.

Front

How do you calculate Simple Interest?

Back

Simple Interest = Principal x Rate x Time.

Front

If Anna invests $2,500 at 5% for 9 years, how much interest does she earn?

Back

Interest = 2500 x 0.05 x 9 = $1,125.

Front

What is the formula for calculating total amount with Simple Interest?

Back

Total Amount = Principal + Simple Interest.

Front

If a loan of $10,550 is paid back at 3% over 10 years, what is the total amount?

Back

Total Amount = 10,550 + (10,550 x 0.03 x 10) = $13,715.

Front

What is the percent of change if a ticket price increases from $100 to $120?

Back

Percent of Change = ((120 - 100) / 100) x 100 = 20%.