You are Here: Home >< Maths

# how to answer this question? percentage increases watch

1. hi guys!

im a bit stuck on how to approach this question and im literally just trying anything. im trying to work out the percentage change through using 1.2 as a representation of a 20% increase in each of the numbers, although I don't really know where I'm going with, I've attempted this question quite a few times using this logic but get different answers each time (none of which are accurate)

also I've already checked, the answer is definitely not G any help would be greatly appreciated! thank you! Attachment 693922693924
Attached Images

2. Do u know what the right answer is. I got 44% but i just wanna check before i divulge how i got there
3. Ask Diane Abbott, I am sure she can help!
4. In the first place the numerator of both fractions should be multiplied by 1.2*1.2*1.2 as a , b , c ,d each individually increase by 20% so you have new a = 1.2 old a
new b = 1.2 old b and so on then you just need to simplify both fraction by 1.2 and use the remaining 1.2*1.2 (1.44) as a common factor and you get that the new value of the sum is the old one * 1.44 so the sum increased by 44%

i've attempted the method in the reply above but for some reason, i still don't fully understand how to work out the answer and obtain 44%. it's just not going into my mind!
6. (Original post by ashaxo99)

i've attempted the method in the reply above but for some reason, i still don't fully understand how to work out the answer and obtain 44%. it's just not going into my mind!
I'll give you the details in this instance.

Each variable is increased by 20%, which is equivalant to multiplying it by 1.2.

So, our new formula is:

We can cancel 1.2 in the numerator and denominator of each to get.

And now pull out the common factor from each, giving.

So, our new value is (1.2)^2 = 1.44 times our old value, or an increase of 44%.
7. (Original post by ghostwalker)
I'll give you the details in this instance.

Each variable is increased by 20%, which is equivalant to multiplying it by 1.2.

So, our new formula is:

We can cancel 1.2 in the numerator and denominator of each to get.

And now pull out the common factor from each, giving.

So, our new value is (1.2)^2 = 1.44 times our old value, or an increase of 44%.
woah, so it really was this simple after all! it feels so good to finally understand this - thank you so much for the help!

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 27, 2017
Today on TSR

### Top unis in Clearing

Tons of places at all these high-ranking unis

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams