Sagot :
[tex]15\%\ multiply\ by\ cost\ of\ dinner\ 25,20\$\\\\
15\%=\frac{15}{100}=0,15\\\\
15\%*25,20=0,15*25,20=3,78\$\\\\
Service\ tip\ is\ equal\ to\ 3,78\$.[/tex]
[tex]15 \% \ of 25.50 \$=\frac{15}{100}* 25.50=\\ \\ =\frac{3}{20}*25.50= 3*1.275=\boxed{3.825 \$-the \ tip}[/tex]