So there is an easy way to find discounts or markdowns with just one multiplication set, by subtracting the percent from 100. So for this, 100-15= 85, so it would be 85 percent. We can even check to make sure.
40×.85=34=40-40×.15= 34
Now we have 34, let's do the second discount.
34×.75=25.5=34-34×.25=25.5
So it would be $25.50 after both of the discounts.