# Thread: Increase my sales at the same rate each week

1. ## Increase my sales at the same rate each week

hello. i am not a mathematician. i'm just a guy who's been up for too many hours today...

i want to sell a cumulative total of X widgets over Y number of weeks. i know that my first week’s sales will be Z. i want to increase my sales at the same rate each week from Z in the first week through to the last week (and ending at my cumulative goal of X).

how do I calculate the rate of increase? can i?

p.s., i'm not a salesman either. just could not think of another way to explain what i'm trying to do...

2. ## Re: little help?

Hi Bills39

Reading your problem I think you are after the constant % increase from Z to X over Y weeks.

If so consider

$\displaystyle \displaystyle X=Z\left(1+\frac{r}{100}\right)^Y$

Solve for $\displaystyle r$

3. ## Re: Increase my sales at the same rate each week

thanks...

i think this equation will help if wanted to know the constant % increase necessary to sell X in the last week... but i am actually looking for the constant % increase in order to end with a cumulative total of X sales (accross all weeks)...

4. ## Re: Increase my sales at the same rate each week

I think it is what you are after.