Lanie is managing a project that involves fact-checking and copyediting 100 articles by September 3. She has three colleagues helping her complete the work. She drafts the following as the completion criteria for the project: "Lanie and her colleagues review 100 articles by September 3." AP3X

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"we first find value of tax in dollars.

the difference between the two prices   is: 23. 54 - 22 = 1.54

therefore the sales tax in dollars is 1.54

the tax % will be   (amount of tax / original cost price ) × 100

(1.54 / 22) × 100  → (0.07) × 100 =   7

so the tax rate is 7%

we can double check the answer.

7 % of 22   → (7/100) × 22 → 0.07 × 22 = 1.54

22 + 1.54 = 23.54"

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30