## Change

### Example

The revenue in January was 55, in February it was 59. How many percent was the increase?

### Formula

=(59-55)/55

We are calculating the relation of change to original value.

### Result

The revenue was 5,36% higher

## Rates

### Example

The price without tax is 252. The tax is 21%. What is the price with tax?

### Formula

=252*(1+21%)

We want to see the price with tax, which includes price without tax and tax.

### Result

The total price with tax is 305.

## How many percent from total does the part make?

### Example

We have 234 customers, from them 32 is from Europe. How many percent of our customers is from Europe?

=32/234

### Result

13,6752% (=0,136752) of our customers are from Europe.

## I know the total, I know the percentage of it and I want to know how big is this part.

### Example

I have 8 kitten, 25% from them are tabby. How many tabby kitten do I have?

### Formula

=8*0,25 (or =8*25%)

### Result

Two kittens are tabby

## I know how big is the part and know how many percent is it. What is the total?

### Example

In a bottle of 40% whisky is 0,28l of pure alcohol. How big is the bottle?

=0,28/0,4

### Result

The bottle has 0,7 l.