The percentage of deliveries Sam has completed is found using the equation
[tex]P=\frac{completed\text{ deliveries}}{\text{total deliveries}}\cdot100[/tex]Replace using the given information
[tex]\begin{gathered} P=\frac{54}{60}\cdot100 \\ P=90 \end{gathered}[/tex]Sam has completed the 90% of his total deliveries.