Answer:
3800
Step-by-step explanation:
Variables:
O - Original cost
N - New cost
c - change factor
Step 1:
Recognize that if something decreases by 19%, it is worth 19% <em>less</em>
This means that the new price, fractionally, is 100% - 19% = 81%
So we can use c as 0.81 (81/100)
Step 2:
Write an equation to represent what is happening
N = O * c
Step 3:
Sub in what we know
3078 = O * 0.81
Step 4:
Rearange and solve
O = 3078 / 0.81 = 3800
Answer:
See below
Step-by-step explanation:
<u>The estimated number:</u>
<u>The difference between the estimated number an 1000 is:</u>
<u>The exact number:</u>
<u>The difference between the exact number and 1000 is:</u>
Hi, hope this helps :)
Feel free to ask me if you do not understand. I used the elimination method.