Simple Interest Calculations and Concepts

This video tutorial covers the concept of simple interest, explaining the relationship between yearly interest, principal, and interest rate. It introduces the formula I = PRT and demonstrates how to use it to solve various problems, including finding missing variables. The tutorial includes practice problems and concludes with instructions for further practice.

What does the variable 'P' represent in the context of simple interest?

• Principal or initial amount

• Percentage rate

• Time in years

• Interest earned

Which of the following is the correct formula for calculating simple interest?

• I = P + R + T

• I = P * R * T

• I = P - R - T

• I = P / R / T

If the principal is $100, the rate is 5%, and the time is 3 years, what is the interest earned?

• $15

• $20

• $10

• $5

How do you convert an interest rate from a percentage to a decimal?

• Multiply by 100

• Subtract 100

• Divide by 100

• Add 100

In a problem where the interest earned is $20, the principal is $500, and the rate is 4%, what is the time in years?

• 3 years

• 4 years

• 2 years

• 1 year

If the principal is missing, the interest rate is 10%, the time is 7 years, and the interest earned is $35, what is the principal?

• $50

• $100

• $200

• $150

What is the interest rate if the principal is $200, the time is 2 years, and the interest earned is $6?

• 1.5%

• 2%

• 2.5%

• 3%

JD opened a savings account with $425. After two years, he earned $10.20 in interest. What was the annual interest rate?

• 2.4%

• 4.8%

• 1.2%

• 3.6%

If the principal is $6,000, the rate is 3%, and the time is 4 years, what is the interest earned?

• $600

• $720

• $960

• $840

In a problem where the interest is $320, the principal is $2,000, and the time is 2 years, what is the interest rate?

• 6%

• 9%

• 7%

• 8%