The board game normally costs 30 dollars, and now it's on sale for a quarter less then the original price. To determine what the price is now that it's on sale, we have to begin by multiplying the original price by the discount, then dividing it by 100.
30 * 25 / 100
From this, we get 7.5. This is how much you save because of the 25% discount. Now we're going to subtract the original price by the amount you saved.
30 - 7.5
This results in your final answer, the sale price of the board game is 22.5