A shirt in on sale for 25% at the total department store.There is also a 4% sales tax.What is the total cost of the shirt,including the salex tax?

Question

It's hard, its algebra.

Answer 1

Let:

x = original price of the shirt

y = final price of the shirt including sales tax

then:

y = 0.75*x*1.04 = 0.78x

 

Answer 2

If you're taking off 25% of an item, that item is now 75% of its original value and you can write that as the expression (.75x). If you add on a 4% sales tax on this sale item, you would multiply the expression by 1.04 (signifying that you are taking that value and adding on 4% of its cost). 

 

Use fractions [(3x/4) and 104/100] for multiplying without a calculator.