The question is asking how much is the raise ?

Thus: Salary after raise - Original Salary = dollar amount raise

Quantity A:

[(x \times 1000) \times(1+ \frac{y}{100}) -(x \times 1000)] = \text{Dollar amount Greata's Raise}\\
(x \times y\%) - x = \text{Dollar amount Greata's Raise}

Quantity B:

[(y \times 1000) \times (1+\frac{x}{100})-(y \times 1000)] = \text{Dollar amount Annitka's Raise} \\
(y \times x\%)-y = \text{Dollar amount Annitka's Raise}

Testing values :

x = 50, y = 21

Quantity A

(50 \times 1.21 )-50=10.5

Quantity B

(21 \times 1.5)-21=10.5

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@HoldMyBeer I was adding the no’s . There i faltered. And got wrong answers.

Only thing about 5lb book is it’s explanation are badly explained.