In one year, a government receives the following revenue: taxes on goods = $30\text{m}$, taxes on income = $500\text{m}$, taxes on services = $20\text{m}$, customs and excise duties = $50\text{m}$. What is the total amount of indirect tax revenue?
- A$30\text{m}$
- B$70\text{m}$
- C$100\text{m}$
- D$500\text{m}$