Dr Rikki Jonas operates a medical practice and body piercing studio. During the $2023$ income year$<$ Dr$.$ Jonas recorded the following transactions $($ inclusive of GST where applicable

$)$: Gross income from medical fees $$660,000,$ Gross income from body piercing $$220,000,$ Gross sales of body jewelry $$110,000.$ Calculate the net GST payable by Dr Jonas from these transactions. a$)$$$30,000$ b$)33,000$ c$)$ $$90,000$ d$)$ $$99,000$