20% tip on a bill of $763.11

This depends if you want to know just the tip or the entire total. But first you would multiply 763.11 by 0.2 to find the tip. So 763.11*0.2≈152.62 the simple tip would be $152.62 but I you want the entire total then add 763.11+152.62=915.73. Your regular tip would be $152.62 while the entire total would be $915.73.