Question

At a spa, the cost of a manicure is $25 and a person decides to leave a 20% tip. What was the total cost of the manicure, including tip?

Answer 1

Total cost

The cost of a manicure is $25.

We want to find the 20% of $25. We have the following equivalence

20% → ?

100% → $25

If we divide each side of the equivalence we will have the same answer

`\begin{gathered} (20)/(100)=(?)/(25) \\ (1)/(5)=(?)/(25) \end{gathered}`

Multiplying both sides by 25 we have:

`\begin{gathered} 25\cdot(1)/(5)=\text{?} \\ 5=\text{?} \end{gathered}`

Then the person decides to leave $5 (that is the 20% of $25)

Then, the total cost including the tip is $25 + $5 = $30

Answer: $30