Jacob left a 15% tip on his dinner bill.
To find the percent tip Jacob left, you can follow these steps:
1. Start with the initial bill amount, which is $18.
2. Subtract the initial bill amount from the total amount paid to find the tip amount:
Tip = Total amount paid - Initial bill amount
Tip = $20.70 - $18
Tip = $2.70
3. Now, we want to find the percent tip. To do this, divide the tip amount by the initial bill amount and then multiply by 100 to get the percentage:
Percent Tip = (Tip / Initial bill amount) * 100
Percent Tip = ($2.70 / $18) * 100
Percent Tip = (0.15) * 100
Percent Tip = 15%