Answer: 21 dollars was his bill before the tip
Step-by-step explanation: 4.20 is 20% of what he paid with no tip included. This means you can set up an equation like this.
4.20 = .2x This means that $4.20 is (is means =) 20% of (of means multiply) x (which is the unknown factor).
Answer:
$21
Step-by-step explanation:
Let the amount of bill before tip was $x.
[tex] \therefore \: 20 \% of \: x = 4.20 \\ \\ \therefore \: \frac{20}{100} \times x = 4.20 \\ \therefore \: x = 4.20 \times \frac{100}{20} \\ \\ \therefore \: x = 4.20 \times 5 \\ \\ \therefore \: x = \$ 21.00[/tex]
Hence, the bill before tip was $21.
