Three Basic Types of Percent Equations
How do you solve them?

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MA.7.1.6. Calculate the percentage of increases and decreases of a quantity.
Algebra and Functions
MA.7.1.0 Students express quantitative relationships by using algebraic terminology, expressions, equations, inequalities, and graphs:
MA.7.1.1. Use variables and appropriate operations to write an expression, an equation, an inequality, or a system of equations or inequalities that represents a verbal description (e.g., three less than a number, half as large as area A).

Common Core Standards
Grade 7
Ratios & Proportional Relationships
Analyze proportional relationships and use them to solve real-world and mathematical problems.
MATH-RPR.7.3. Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.