Planning and operational variance

Leaf limited has had a mixed year.its market share has improved two percentage points to 20% but the overall market had contracted by 5%in the same period. The budgeted sales were 504000units and standard contribution was 12$ per unit. What is the level of actual sales?
Ans – up by a little over five and half percent to 532000units ….
Plz explain the logic n concept behind it…I didn’t understand how they got 532000 units …