[Video] Q22: Of the following, which best approximates the percent decrease in consumption of wood power in the united states from 2000 to 2010 ?

Explanation for Question 22 From the Math (Calc) Section on the Official Sat Practice Test 4

So now for 22, right. We're trying to estimate the percent decrease 2 in consumption of wood from 2000 to 2010. 3 So before we get to the percent, let's get to the actual numbers, 4 right. We'll go up to our chart. We look at the wood category 5 here. We see the in 2000, 6 we were at about 2.25. 7 And then in, um, 2010, we were at two to 8 2.25, 9 and then here in 2010, we were at two. 10 And so we're trying to find the percent decrease, 11 right? And so really, if we're trying to find the percent decrease, 12 that's going to be the difference between 2010 and in 13 2000 divided by your starting point. 14 Right? And so you need to divide by the starting point here rather than 15 the ending point, because you're finding the percent decrease from the starting point, 16 right? You're not decreasing from 2010 on you're decreasing from 2000 17 on. So we know the difference between these is 0.2, 18 five or one fourth. And we need to find that as a percentage of 19 our starting point in 2000, which is 2.25, 20 right? So again, we're going to divide by a 2.25, 21 not two because we didn't decrease from the two. 22 We decreased from the 2.25. 23 And so when we plugged that into our equation, we get 0.1, 24 one, one, you know, all of that repeating. And so as a percentage, 25 we need to multiply that by a hundred to get the percentage and you 26 get about 11% making our best answer E.