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# Percent Equations

## Equations to solve for rates, totals, and parts.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Simple Interest

by CK-12 //basic
Learn to calculate the simple interest on a loan using the simple interest formula.
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## Simple Interest Equation to Find Interest Rate

by CK-12 //basic
Covers calculating interest rates, borrowing money, paying money back, and the fees associated with borrowing money.
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## Simple Interest

by CK-12 //basic
Covers how to calculate unknowns besides the interest rate, like the amount of time it takes to earn a specific amount of interest.
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## Solve Real World Problems Involving Simple Interest

by CK-12 //basic
Learn to solve real-world problems involving simple interest
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• Video

## The Simple Interest Formula

by CK-12 //basic
Explains how to solve interest problems using the simple interest formula.
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• 1
• Real World Application

## How Balloons Destroyed the Economy

by CK-12 //basic
Learn how balloon mortgages caused an economic crisis.
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