Answer:
$49.38
Explanation:
Since .81 euros is worth $1, you would do .81÷1 to get 1.23456790123, which is the rate of euros to dollars.
Since she has 40 euros, you would do:
40×1.23456790123 = 49.3827160492
Round that to the nearest cent, and you get $49.38
Hope this helps!