The price of a $250 coat increased 7% last year. the coast is now on sale for one-half off. what is the sale price?

Well firstly you need to find what 7% of 250 is:
 250 x .07 = 17.5
(.07 is 7% in decimal form)

and then you add that to the original value:
250+17.5= 267.5

Now that you've found the price with the 7% increase you find the half-off price.
267.5 / 2 = 133.75

There you go! The price of the coat would now be $133.75.
Hope this helped :)