The following information is available about Why Companies product mix:

The following information is available about Why Companies product mix:
Product	A	B	C	D
Sales mix (units)	5	4	3	2
Unit SP	$ 6.00	$ 10.00	$ 14.00	$ 18.00
Unit VC	$ 3.00	$ 6.00	$ 9.00	$ 12.00
Fixed costs	$ 1,900.00
Tax	24%

Current sales are 900 bundles.

Due to market pressure, Why Companies believes they will have to decrease their selling
prices by 10% in order to maintain their current level of sales.
Shareholders, on the other hand, expect to see an increase in profit after tax
of 10% for the coming year.
Based on this information, by what percentage would variable costs have to decrease in
order to achieve shareholder expectations?