You are Here: Home >< Maths

# Is there a formula for this? Watch

1. Say that there was a report that went 'Apple's profits were 8% lower this year than they were last year'.... is there a formula that you can use to work out the exact figure of Apple's profits last year? Assume that the figure this year is £500,000 (not representative of Apple's performance i know but that doesn't matter), could you find the figure for last year if you just knew that there was a 8% decrease?

I vaguely recall doing something like this in GCSE and i asked my mate about it but he seems to think that there's no way to get an exactly accurate answer and now i'm confused. Any help would be appreciated.
2. Formula? Just logic it..

The base year is last year = 100%.

This year is 8% lower than last year = 92%.

Thus, given this year is 500000, last year is 500000/.92 = 543478.26...
3. (Original post by theonefrombrum)
Say that there was a report that went 'Apple's profits were 8% lower this year than they were last year'.... is there a formula that you can use to work out the exact figure of Apple's profits last year? Assume that the figure this year is £500,000 (not representative of Apple's performance i know but that doesn't matter), could you find the figure for last year if you just knew that there was a 8% decrease?

I vaguely recall doing something like this in GCSE and i asked my mate about it but he seems to think that there's no way to get an exactly accurate answer and now i'm confused. Any help would be appreciated.
If the profits 8% lower then they were last year will mean the last-year profits
were the 100% and now they are 92%.
Knowing the figute this year (500,000) you can find it for last year as follows
4. (Original post by aznkid66)
Formula? Just logic it..

The base year is last year = 100%.

This year is 8% lower than last year = 92%.

Thus, given this year is 500000, last year is 500000/.92 = 543478.26...
Thanks a lot

(Original post by ztibor)
If the profits 8% lower then they were last year will mean the last-year profits
were the 100% and now they are 92%.
Knowing the figute this year (500,000) you can find it for last year as follows

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: March 27, 2013
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.