SmartWater

That is correct!

https://web2.0calc.com/questions/combinations_18

Thanks melody

Sorry I think you accidentaly cut the question off. Could you try fixing it by editing?

https://web2.0calc.com/questions/stuck_16

Lemme have a go at this. 

20% of a number is 1/5 of the number

So we can do 1/5x50=10. So she has to pay $10 per delivery

   (Btw that was the example that the problem gave I think)

Now we can use that mothod for all the prices
RIght now we are looking for emilies profit.

15->12
12->9.60
20->16
18->14.40
22->17.60
(Sorry that I didnt add the dollar sign I thought it would be confusing)


Now lets add them up
We will get $69.60 excluding the tip
Now we add the tip to it.

The total tip is $21
Now we add $21+69.60
$90.60

https://web2.0calc.com/questions/geometry_42685
or
https://web2.0calc.com/questions/find-the-ratio-of-the-area-of-a-regular-hexagon-with-sides
     

https://web2.0calc.com/questions/help-me-plz_34

https://web2.0calc.com/questions/help-angle-problem

https://web2.0calc.com/questions/geometric-sequence_22

https://web2.0calc.com/questions/from-the-top-of-a-building-60-feet-high-the-angle-of-elevation-of-the-top-of-a-pole-is-14-degrees-at-the-bottom-of-the-building-the-angle

PEOPLE ALREADY ASKED THIS

I year later

me," MAN HE HAS BEEN WAITING FOR A WHOLE YEAR!!!"

  Btw I got 52 i dont know if you need the answer after all this time though

There are some great explanations out there. Start checking them out before you post an question

https://web2.0calc.com/questions/help_16304 (No credit to me from the link)