Section 9 - Percent (Edition 2)

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Category 43 Example 3 - mental math

The two discounts as decimal are 0.86 and 0.77. Multiplying them with the original price will give the discounted price.

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Category 44 Example 1 Question 1 - mental math

The discount = decrease as decimal is 0.85 and sales tax = increase = 1.06. Dividing them with the final price will give the original price.