Asign the original price of the product by x, the price after the first increase by y₁, and the price after the second increase by y₂.

$$y_1=x·1,2$$

$$y_2=y_1·1,2=\left(1,2·x\right)·1,2$$

$$y_2=1,44·x$$

We calculate the increase by comparing the original price with the latest price:

$$\frac{1,44·\cancel{x}}{\cancel{x}}=1,44$$

or expressed as a percentage:

$$1,44·100 \%=144 \%$$

The increase itself is therefore: