Respuesta :

ok this is really easy. you are going to multiply 45.80 by 0.20 you see the two dots on the percent sign % well that is how many spots to the left you are going to move your decimal point. Which well make you have 0.20 instead of 20%. and your answer will be $9.16 and if you want to know the total just add $9.16 to $45.80 then your answer will be $54.96

Rosa and her friend leave a tip of $9.16 which is 20% of the total bill amount and this can be determined by using the unitary method.

Given :

Rosa and her friend are eating out for dinner. The bill is 45.80.

The following steps can be used to determine the amount of tip they leave:

Step 1 - The unitary method can be used to determine the amount of tip they leave.

Step 2 - According to the given data, the bill is $45.80 which is 100% of the amount.

Step 3 - If the 100% amount of the bill is $45.80 then the 20% amount of the bill is:

[tex]=\dfrac{45.80}{100}\times 20[/tex]

Multiply 45.80 by 20 in the above expression.

[tex]=\dfrac{916}{100}[/tex]

Divide 916 by 100 in the above expression.

= $9.16

So, they leave a tip of $9.16.

For more information, refer to the link given below:

https://brainly.com/question/24406804

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