Table 4: Comparisons between the total operation times on whether tugboats return to the base.

Number of shipsRCOMUCOM
Results if tugboats do not return to the base ( )Results if tugboats return to the base ( )GAP*Results if tugboats do not return to the base ( )Results if tugboats return to the base ( )GAP*

103743267539.93%3743267539.93%
154983400524.42%4951395225.28%
206800528528.67%6705520628.79%
258481657528.99%8405650329.25%
3010012800725.04%9988795125.62%

Percentage that is larger than that of , which can be calculated by %.