pls i want help on this sum

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▹ Answer
a. $103.50
b. £4400
▹ Step-by-Step Explanation
$90 * 0.15 = $13.50
$90 + $13.50 = $103.50
£5000 x 0.12 = £600
£5000 - £600 = £4400
Hope this helps!
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