If trip fuel is 1,000 units, contingency fuel at 5 percent is 50 units.

### Why this is right Five percent of 1,000 is 0.05 × 1,000, which equals 50. The contingency amount is measured in the same units as trip fuel. ### The concept The percentage is applied to trip fuel alone. After calculating contingency, it is added as a separate component with alternate fuel and final reserve to form the total stated requirement. ### Worked numbers - **Given**: trip fuel 1,000 units; rate 5 percent. - **Find**: contingency amount. - **Formula**: contingency = 0.05 × trip fuel. - **Solve**: 0.05 × 1,000 units = 50 units. - **Answer**: 50 units. - **Check**: 50 is one twentieth of 1,000, equal to 5 percent. ### Terms - **Trip fuel**: Fuel planned for the intended route. - **Contingency fuel**: The additional amount calculated as 5 percent of trip fuel. ### Remember A percentage calculation keeps the unit of the amount it is applied to.