The question informs us that a large group has a party and spends $ 125.86. Then the waiter is given a 20% tip.
To find how big his tip was, we would use the formula below;
[tex]\text{Tip(\$)}=\text{ \%Tip}\times Expenses[/tex]
We can then substitute the necessary parameters into the equation.
[tex]\begin{gathered} \text{Tip(\$)}=\frac{20}{100}\times125.86 \\ \text{Tip(\$)}=0.2\times125.86 \\ \text{Tip(\$)}=\text{\$}25.17 \end{gathered}[/tex]
Therefore, the answer is;
Answer: $25.17
