To find the amount of change, \( c \), that Mela receives after buying a pair of shoes that costs $40.99 and giving the cashier $50, we can set up the following equation:
\[ c = 50 - 40.99 \]
Now, let's calculate the change:
\[ c = 50 - 40.99 = 9.01 \]
So, Mela's change is $9.01.