EXPLANATION
If the bill is of $650 and the tip a 15% of that amount the total paid was:
[tex]\text{bill + tip = total paid}[/tex]As the tip is a 15% (0.15 in decimal form) of that amount the total would be:
[tex]650+650\cdot0.15=[/tex]Multiplying numbers:
[tex]650\text{ + 97.5=}747.5[/tex]The total paid was $747.5
