# Finding a percentage change

**Finding a percentage increase or decrease**

The percentage increase or decrease can be calculated this using the following formulae:

**Finding a percentage increase**

A baby Panda weighs 3.6 kg at birth. After 8 weeks the baby Panda’s weight has increased to 4.3 kg.

What is the baby’s percentage increase in weight?

The actual increase = 4.3 kg – 3.6 kg

= 0.7 kg

**Finding a percentage decrease**

If a shirt was previously $26 and where reduced to $18, was is the percentage decrease?

The actual decrease = $26 – $18 = £8

**Finding a percentage profit**

A shopkeeper buys fruit bars wholesale at a price of 30p per bar. He then sells the fruit bar in his shop at 48p each.

What is the percentage profit?

**Finding a percentage loss**

A bond dealer buys a number of bond at £3.66 each. After a week the price of the shares has dropped to £3.20.

What is the percentage loss?

Point to note:

- The number of bonds bought does not make a difference to the percentage loss as it is a proportion of the amount therefore it makes a different to her actual loss only.
- Always use the same units when working out the percentage profit/loss.