R-41

Core Math Goal: How can you use the same proportions to find percentages of a value when you know a certain percentage of the same value?

TMWYK: About using proportions to solve problems


$22,500

Markup 10%

Original price=??

Strategy:

Delany's Idea

10+100=110 (full price + mark up price)

10         2050
110  =   22550 (price of the car)   

***Flynn's Idea: Maybe they need to be equivalent fractions. We   can check it with that. Scale factor is 205. This means that they are equal fractions and are in proportion.
Proportional Strategy

*We should divide by 11. 10 is the mark up price 
110
10   =   11

10% of 110=11



New Problem: 

22,770=resale price
Original proce=19,800

What is the markup?