Finding the Original Amount and Amount of Change Using Proportions and Equations

This video tutorial teaches how to find the original amount and the amount of change given the percent change and final amount using proportions and equations. It uses a practical example of calculating the pre-tax price of a couch and the sales tax from a given final price. The lesson reviews solving proportions and equations, emphasizing the difference between percent change and the actual amount of change. It provides two methods: using proportions and using equations, to solve for the original amount and the tax.

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