Tumor sample and heterozygous SNVs: what is the genotype of the normal cells?
Your initial information/image and actual question seem pretty unrelated to me, but I'll do what I can.

If you have a heterozygous SNV in a malignant population of cells, it really depends on when the mutation occurred for you to know the genotype of wildtype cells. It could have been there since birth (a germline mutation passed down from the parents) or have been acquired throughout the person's life and clonally expanded (somatic mutation). 

Unfortunately, you have no way to differentiate between these two types of SNVs just by sequencing the tumor cells. If you want to know true somatic mutations that are found only in the tumor cells, you need to sequence a matched normal control from the same patient (preferably from the same cell type). This is why most large cancer sequencing studies include not only tumor samples, but normal cells from the same patient - see TCGA or ICGC for examples.