VARIANCES – SALES

Hi,
I need your help with this problem (from Kaplan, Question 257 / 5)
———————————
Fort Co produces and sells three models of family car: a basic model (the Drastic), an
upgraded model (the Bomber) and a deluxe model (the Cracker). All of the cars are priced
to achieve a 6% mark up on standard cost. For the month of June, Fort Co budgeted to sell
30,000 units of the Drastic and so have 10% market share of the budgeted sales at a price
of $10,600 each. Fort Co. actually achieved a 15% share of the market, though the market
had actually contracted by 5%.
The following information is available for July.

Drastic Bomber Cracker
Sales units:
– Budgeted 27,000 15,000 18,000
– Actual 26,000 16,000 14,000

Budgeted sales price $10,600 $13,250 $16,960

5. Which TWO of the following statements are true?
(1) The sales mix variance would not give useful information to the management
of Fort Co if the Cracker was a van.
(2) The sales mix variance will not be affected if the labour efficiency on the
Drastic production line increases, all other factors remaining the same.
(3) The market share variance is a planning variance, not an operational variance.
(4) If the mix variance was calculated as a physical quantity, the answer would
always be zero.
————————-
The true statements are 1 and 4. I did not get the point at all. Could you explain?
Thanks a lot,