It's a tough result for Spark today... reporting a 72% drop in full year net profit... with revenue down 14%.  

The big drop comes after last year's results were boosted by the sale of spark's cell tower network... but the company has acknowledged it's been a challenging year in tough economic conditions.  

Spark's chief executive Jolie Hodson told Heather du Plessis-Allan it has been a tough year for the company.

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