Answer:
$63.75
Explanation:
25 * $3.10 = $77.50 is the total money Sheila got from selling cakes
$0.55 * 25 = $13.75 is the cost for ingredients for all the 25 cakes.
$77.50 - $13.75 = $63.75 is the total money Sheila earned without using her own
Hope this helps:)