How do you write an equation to represent a real world situation

A

An item sells for 100 dollars before tax and 110.00 after tax. The store you bought it from tells you that they will allow you to put it on your credit card if you agree to make 12 equal payments on the item. How much do you pay each month?

Answer 110/12 = $9.17

B

You find out your credit card refuses to take the charge. The store, unwilling to let the sale go says that they will allow you credit if you agree to pay 11 dollars per month for 12 months. How much more are you paying than you would if you could pay the full amount now?

12* 11 = 132 dollars.

The item costs 110 dollars. You are paying out 132 dollars that is 132 - 110 = 22 more than just buying the item.

C

What was the tax on the original item?

110 - 100 = 10 dollars.

D

What does the tax amount to as a %?

% = 10/100 * 100 = 10%

That is one type of question you could make up. Many people don't know how to do this and wind up putting too much debt on their credit cards. The result is bankruptcy.  Never put anything on a credit card that you can't pay off in a very short period of time.

Another is comparative shopping but that's for another question.

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,